766 . A circular grass walk of 2 feet wide surrounded a pond of 100 fet in diameter. In terms of π, how many square feet grass walk are there?

A. 204 π
B. 102 π
C. 404 π
D. 202 π

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Answer: Option A

Explanation:

767 . A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 percent larger than the original. By what percentage has the area of the logo increased?

A. 50
B. 80
C. 100
D. 125
E. None of these

View Answer	Favorite Question

Answer: Option D

Explanation:

768 . A circular swimming pool is to be filled with water. If the radius of the pool is 2m and the height of the pool is 7m, what volume of water will be required to fill the pool ?

A. 88m^3
B. 176m^3
C. 25.14m^3
D. none of these

View Answer	Favorite Question

Answer: Option A

Explanation:

Volume

=πr²h

=(22/7)×2²×7

=88m³

(ans)

769 . A circular wheel 28 inches in diameter rotates (moves) the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minute does the larger wheel make in terms of x?

A. 12x
B. 48x
C. 24x
D. 36x
E. None of these

View Answer	Favorite Question

Answer: Option B

Explanation:

Let the revolutions made by larger wheel per minute be R.

Circumference of smaller wheel, 2 π r = 2 x π x (28/2) = 28π

Circumference of larger wheel, 2 π r = 2 x π x (35/2) = 35π

Speed of smaller wheel per minute = 60x

Distance covered by larger wheel per minute = Distance covered by smaller wheel per minute

or, R x 35π = 28π x 60x

or, R = 28π x 60x / 35π = 48x

770 . A circular wheel 28 inches in diameter rotates the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minutes does the larger wheel make in terms of x?

A. 12x
B. 24x
C. 36x
D. 48x

View Answer	Favorite Question

Answer: Option D

Explanation:

ছোট চাকার ব্যাস = 28 ইঞ্চি

ছোট চাকার ব্যাসার্ধ r1 = 28/2 = 24 ইঞ্চি

ছোট চাকার পরিধি = 2πr1 = 28π ইঞ্চি

বড় চাকার ব্যাস = 35 ইঞ্চি

বড় চাকার ব্যাসার্ধ r2 = 35/2 ইঞ্চি

বড় চাকার পরিধি = 2πr2 = 2 × π × 35/2 = 35π ইঞ্চি

ছোট চাকাটি x বার ঘুরে যায় = 28πx ইঞ্চি

ছোট চাকাটি 1 সেকেন্ডে যায় = 28 πx ইঞ্চি

ছোট চাকাটি 60 সেকেন্ডে যায় = ( 60 × 28πx) = 1680πx ইঞ্চি

বড় চাকাটি 1 মিনিটে ঘুরবে = 1680πx /35π = 48x বার।

771 . A cistern can be filled in 10 hours but it takes 12 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

A. 60 min
B. 80 h
C. 90 h
D. 60 h

View Answer	Favorite Question

Answer: Option D

Explanation:

772 . A cistern is normally filled with eater in 10 hours but takes 5 hours longer to fill because of a leak in its bottom . If the cistern is full, the leak will empty the cistern in -

A. 20 hours
B. 30 hours
C. 40 hours
D. 50 hours

View Answer	Favorite Question

Answer: Option B

Explanation:

জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 2/5
B. 3/5
C. 4/5
D. 3/2

View Answer	Favorite Question

Answer: Option A

Explanation:

774 . A class of 120 has 25% girls. If 10% of the boys and 20% of the girls attended a picnic then what percentage of the class attended the picnic?

A. 20%
B. 25%
C. 13%
D. 12.5%
E. None of these

View Answer	Favorite Question

Answer: Option D

Explanation:

Total students = 120

number of girls = 120*25% = 30

number of boys = (120 - 30) = 90

munber of students attended picnic = 90*10% + 30*20% = 6 + 4 = 15

% of students attended picnic = 15/120*100 = 12.5

ans: 12.5%

775 . A class of 50 girls and 70 boys sponsored a party. If 40% of the girls and 50% of the boys attended the party, approximately what percent of the class attended?

A. 40
B. 42
C. 44
D. 46

View Answer	Favorite Question

Answer: Option D

Explanation:

First, we need to find out 40% of the 50 girls. That is 50 x 0.4 = 20 girls.

Next, we need to find out 50% of the 70 boys. That is 70 x 0.5 = 35 boys.

Therefore, 20 + 35 = 55 people attended.

In total there were 50 + 70 = 120 people.

So the percent would be 55/120 = 11/24 ≈ 45.83% ≈ 46%.

776 . A class of 80 students has 25% girls. If 10% of the boys and 20% of the girls attended a picnic then what percentage of the class attended the picnic ?

A. 20%
B. 25%
C. 13%
D. 12.5%
E. None of these

View Answer	Favorite Question

Answer: Option D

Explanation:

25% of 80=20

So,

Girls=20

Boys=80-20=60

10% of 60=6

20% of 20=4

Total students=80, Students in picnic=6+4=10

Now,

(10×100)/80=12.5%

777 . A clock falls behind 10 minutes each day. How many days will it take to reach a point where the clock will indicate the correct time?

A. 36
B. 40
C. 72
D. 90

View Answer	Favorite Question

Answer: Option C

Explanation:

Loss time for every day 10 min

Loss time for 6 days is 6×10 min = 60 min = 1 hours

i.e For every 6 days hour hand clock back 1 h

We know there are 12h in a clock

If the chock 12 backed then it will give us real time

So required time for showing real time is = 6×12 = 72 days

Ans. 72 days

778 . A clock is started at noon. By 10 minutes past 5, the hour hand has turned through :

A. 145 degree
B. 150 degree
C. 155 degree
D. 160 degree

View Answer	Favorite Question

Answer: Option C

Explanation:

Hints: Angle traced by hour hand is 12 hrs = 360degree

Angle traced by hour hand in 5 hrs 10 min i.e, 31/6 hrs

= 360/12 × 31/6

= 155 degree

779 . A clock loses ( falls behind ) 10 minutes each day. How many days will take to reach a point where the clock will indicate the correct time ?

A. 36
B. 72
C. 120
D. None of these

View Answer	Favorite Question

Answer: Option B

Explanation:

Loss time for every day 10 min

Loss time for 6 days is 6×10 min = 60 min = 1 hours

i.e For every 6 days hour hand clock back 1 h

We know there are 12h in a clock

If the chock 12 backed then it will give us real time

So required time for showing real time is = 6×12 = 72 days

Ans. 72 days

Bangladesh Bank - Officer - 2001

A. 3:15
B. 7:15
C. 8:45
D. 9:45

View Answer	Favorite Question

Answer: Option C

Explanation:

Here, mirror ttime is = 3:15

So, Real time = 11:60-3:15 .(where 11-3 & 60-15)= 8:45

সমন্বিত ৭ ব্যাংক || অফিসার (ক্যাশ) (24-05-2024)

766 . A circular grass walk of 2 feet wide surrounded a pond of 100 fet in diameter. In terms of π, how many square feet grass walk are there?

767 . A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 percent larger than the original. By what percentage has the area of the logo increased?

768 . A circular swimming pool is to be filled with water. If the radius of the pool is 2m and the height of the pool is 7m, what volume of water will be required to fill the pool ?

769 . A circular wheel 28 inches in diameter rotates (moves) the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minute does the larger wheel make in terms of x?

770 . A circular wheel 28 inches in diameter rotates the same number of inches per second as a circular wheel 35 inches in diameter. If the smaller wheel makes x revolutions per second, how many revolutions per minutes does the larger wheel make in terms of x?

771 . A cistern can be filled in 10 hours but it takes 12 hours due to a leak in its bottom. If the cistern is full, then the time that the leak will take to empty it is:

772 . A cistern is normally filled with eater in 10 hours but takes 5 hours longer to fill because of a leak in its bottom . If the cistern is full, the leak will empty the cistern in -

773 . A class has 12 boys and 18 girls. What fraction of the class are boys?

774 . A class of 120 has 25% girls. If 10% of the boys and 20% of the girls attended a picnic then what percentage of the class attended the picnic?

775 . A class of 50 girls and 70 boys sponsored a party. If 40% of the girls and 50% of the boys attended the party, approximately what percent of the class attended?

776 . A class of 80 students has 25% girls. If 10% of the boys and 20% of the girls attended a picnic then what percentage of the class attended the picnic ?

777 . A clock falls behind 10 minutes each day. How many days will it take to reach a point where the clock will indicate the correct time?

778 . A clock is started at noon. By 10 minutes past 5, the hour hand has turned through :

779 . A clock loses ( falls behind ) 10 minutes each day. How many days will take to reach a point where the clock will indicate the correct time ?

780 . A clock seen through a mirror, shows quarter past three. What is the correct time shown by the clock?

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