721 . A box contains 10 electric bulbs from which 2 bulbs are defective. Two bulbs are chosen at random. What is the probability that one of them is defective?

A. 3/10
B. 25/68
C. 16/45
D. 8/33

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Answer: Option C

Explanation:

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722 . A box contains 12 poles and 7 pieces of net. Each piece of net weighs 0.2 gm. each pole weighs 1.1 gm. The box and its contents together weigh 16.25 gm. How much does the empty box weigh?

A. 1.2gm
B. 1.6gm
C. 2.75gm
D. 6.15gm

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Answer: Option B

Explanation:

Let's denote the weight of the empty box as "E" grams.

Now, let's calculate the total weight of the box and its contents:

Weight of 12 poles = 12 poles * 1.1 gm/pole = 13.2 gm
Weight of 7 pieces of net = 7 pieces * 0.2 gm/piece = 1.4 gm

So, the total weight of the poles and net is 13.2 gm + 1.4 gm = 14.6 gm.

Now, we are given that the box and its contents together weigh 16.25 gm. Therefore, we can write the equation:

E (weight of the empty box) + 14.6 gm (weight of poles and net) = 16.25 gm (total weight)

Now, solve for E:

E + 14.6 gm = 16.25 gm

Subtract 14.6 gm from both sides:

E = 16.25 gm - 14.6 gm

E = 1.65 gm

So, the weight of the empty box is 1.65 grams, which is equivalent to 1.6 grams when rounded to one decimal place.

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Three Combined Bank Recruitment - Senior Officer 03 .08.2018 ||

A. 32
B. 48
C. 64
D. 96
E. None of these

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Answer: Option C

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724 . A box contains 200 marbles, 25% of them are red and the rest are black. From the box, you gave your brother a certain number of marbles of which 60% are black. You then found that among the remaining marbles, only 20% are red. How many marbles did you give

A. 50
B. 60
C. 80
D. None

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Answer: Option A

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725 . A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?

A. 2/7
B. 3/14
C. 8/21
D. 5/21

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Answer: Option B

Explanation:

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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 2/17
B. 4/17
C. 4/11
D. 3/13

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Answer: Option B

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727 . A box contains 48 balls some red and some black. Each of the followings could be the ratio of red to black balls except ---

A. 1:1
B. 3:1
C. 4:3
D. 5:3

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Answer: Option C

Explanation:

48 can not be divided by (4 + 3 = 7). So, the balls can not be divided into 4:3 ratio.

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728 . A box contains 90 nuts each of 100 gm and 100 bolts each of 150 gm. If the entire box weighs 35.5 kg, then find the weight of the empty box

A. 10.5kg
B. 11kg
C. 11.5kg
D. 24 kg

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Answer: Option C

Explanation:

Weight of the nut and bolts = 90×100 + 100×150 = 9000 + 15000 = 2400gm = 24 kg

So, weight of the empty box = 35.5 - 24 = 11.5 kg

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বাংলাদেশ ব্যাংক || অফিসার (ক্যাশ) (21-07-2023)

A. 10 kg
B. 10.5 kg
C. 11 kg
D. 11.5 kg
E. None of these

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Answer: Option D

Explanation:

Weight of the nut and bolts = 90×100 + 100×150 = 9000 + 15000 = 2400gm = 24 kg

So, weight of the empty box = 35.5 - 24 = 11.5 kg

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Jamuna Bank Ltd - Probationary Officer - 2009

A. m+4 is divisible by 8
B. m-2 is divisible by 4
C. m+6 is divisible by 8
D. None of these

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Answer: Option B

Explanation:

ব্যাখাঃ

মোট চকলেটের সংখ্যা হবে ( ১৬ এর গুনিতক + ৬)

অর্থাৎ সংখ্যাটি ২২, ৩৮, ৫৪ প্রভৃতি হতে পারে।

এখন, ২২ + ৪ = ২৬ যা দ্বারা ৮ বিভাজ্য নয়

২২ + ৬ = ২৮ যা দ্বারা ৮ বিভাজ্য নয়

২২ - ২ = ২০ যা ৪ দ্বারা বিভাজ্য নয়

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731 . A box has 210 coins of Tk. 2 and TK. 1. The ratio of the values of the coins is 12:29. How many Tk. 1 coins were there? (একটি বাক্সে ২ টাকা এবং ১ টাকার ২১০টি কয়েন রয়েছে। মুদ্রাগুলির মানের অনুপাত হল ১২: ২৯। ১ টাকার কতটি কয়েন ছিল?)

A. 36
B. 72
C. 174
D. 92

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Answer: Option C

Explanation:

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Dutch Bangla Bank || Sales Manager (18-09-2024) || 2024

A. 27
B. 12
C. 9
D. 6

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Answer: Option A

Explanation:

Let's consider the volume of each box.

The first box is in the form of a cube, so all sides are equal. Let the length of one side of the first box be "a."

Volume of the first box = a^3
The second box has inside dimensions three times those of the first box. So, each side of the second box is 3a (since it's three times the length of the first box).

Volume of the second box = (3a)^3 = 27a^3
Now, let's find out how many times as much the second box contains compared to the first box:

(Volume of the second box) / (Volume of the first box) = (27a^3) / (a^3) = 27

So, the second box contains 27 times as much as the first box.

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Three Combined Bank Recruitment - Senior Officer 03 .08.2018 ||

A. 7 km
B. 10 km
C. 4 km
D. 5 km

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Answer: Option B

Explanation:

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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 16
B. 24
C. 26
D. 28

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Answer: Option D

Explanation:

let

x = number of questions

Therefore,

correct answer = 50% of x

10 + 1/4 (x - 12) = 0.5x

10 + 0.25x - 3 = 0.5x

7 = 0.5x - 0.25x

7 = 0.25x

x = 7 / 0.25

x = 28

Therefore, they are 28 questions on the test.

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735 . A boy got 50% of the questions on a test correct. If he had 10 questions correct out of the first 12, and 25% of the remaining questions correct, how many questions were on the test ?

A. 16
B. 24
C. 26
D. 28
E. None of these

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Answer: Option D

Explanation:

let

x = number of questions

Therefore,

correct answer = 50% of x

10 + 1/4 (x - 12) = 0.5x

10 + 0.25x - 3 = 0.5x

7 = 0.5x - 0.25x

7 = 0.25x

x = 7 / 0.25

x = 28

Therefore, they are 28 questions on the test.

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721 . A box contains 10 electric bulbs from which 2 bulbs are defective. Two bulbs are chosen at random. What is the probability that one of them is defective?

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722 . A box contains 12 poles and 7 pieces of net. Each piece of net weighs 0.2 gm. each pole weighs 1.1 gm. The box and its contents together weigh 16.25 gm. How much does the empty box weigh?

723 . A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?

724 . A box contains 200 marbles, 25% of them are red and the rest are black. From the box, you gave your brother a certain number of marbles of which 60% are black. You then found that among the remaining marbles, only 20% are red. How many marbles did you give

725 . A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?

726 . A box contains 4 tennis ball 6 season and 8 dues balls . 3 balls are randomly drawn from the box. What is the probability that the balls are different ?

727 . A box contains 48 balls some red and some black. Each of the followings could be the ratio of red to black balls except ---

728 . A box contains 90 nuts each of 100 gm and 100 bolts each of 150 gm. If the entire box weighs 35.5 kg, then find the weight of the empty box

729 . A box contains 90 nuts each of 100 gms an d 100 bolts each of 150 gms. If the entire box weighs 35.5 kgs , then the wight of the empty box is--

730 . A box contains m number of chocolates. After distributing the chocolates equally among 16 students you are left with 6 chocolates. Which of the following must be true?

732 . A box is made in the form of a cube. If a second cubical box has inside dimensions three those of the first box, how many times as much does the second contain?

733 . A boy goes to school at a speed of 5 km/h and returns to the village at a speed of 4 km/hr. If he takes 4 hours and 30 minutes in all, what is the distance between the village and the school?

734 . A boy got 50% of the questions on a test correct . If he had 10 questions correct out of the first 12 and 25% of the remaining questions correct, how many questions were on the test?

735 . A boy got 50% of the questions on a test correct. If he had 10 questions correct out of the first 12, and 25% of the remaining questions correct, how many questions were on the test ?

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