796 . 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

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Answer: Option D

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797 . 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

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Answer: Option B

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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

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

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Answer: Option A

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799 . 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

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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%

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800 . 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

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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%.

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801 . 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

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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%

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802 . 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

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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

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803 . 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

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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

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804 . 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

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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

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Bangladesh Bank - Officer - 2001

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

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Answer: Option C

Explanation:

Here, mirror ttime is = 3:15

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

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সমন্বিত ৮ ব্যাংক ও ১ টি আর্থিক প্রতিষ্ঠান || সিনিয়র অফিসার (সাধারণ) (20-01-2023)

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

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Answer: Option C

Explanation:

Here, mirror time is = 3:15

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

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NRBC Bank PLC || Trainee Assistant Officer (TAO) (26-10-2024) || 2024

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

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Answer: Option C

Explanation:

Here, mirror ttime is = 3:15

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

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

A. 24 days
B. 30 days
C. 60 days
D. 60 hours

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Answer: Option C

Explanation:

1 hour = 60 min

24 hour = 1 day

Clock slows down by 1 min in 1 day

So, clock slows down by 60 min in 60 days.

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809 . A cloth merchant has announced 25% rebate in price. If one needs to have a rebate of Tk.40 then how many shirts each costing Tk.32, he should purchage?

A. 10
B. 7
C. 6
D. 5

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Answer: Option D

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810 . A club collected exactly Tk. 599 from its members. If each member contributed at least Tk. 12, what is the largest numbers the club could have?

A. 43
B. 44
C. 49
D. 50

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Answer: Option C

Explanation:

We can find out the largest number of members when everyone is contributing the least amount, which is 12 taka.

So, 599/12≈49

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796 . 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:

797 . 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 -

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

799 . 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?

800 . 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?

801 . 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 ?

802 . 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?

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

804 . 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 ?

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

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

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

808 . A clock slows down one minute every 24 hours. How long will it take to slow down by one hour?

809 . A cloth merchant has announced 25% rebate in price. If one needs to have a rebate of Tk.40 then how many shirts each costing Tk.32, he should purchage?

810 . A club collected exactly Tk. 599 from its members. If each member contributed at least Tk. 12, what is the largest numbers the club could have?

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