Ques:- There is a leak in the bottom of a cistern. When the cisternis thoroughly repaired, it would be filled in 3 ? hours. It now takes half an hour longer. If the cistern is full, howlong will the leak take to empty the cistern?
A. 24 hours
B. 28 hours
C. 21 hours
D. 27 hours
E. None of these
Recent Answer : Added by DK BOSS On 2021-07-17 06:18:17:
Time taken to fill repaired cistern = 12 mins
In 1 min, pipe will fill = 1/12
Time taken to fill cistern with leak = 12 + 18 = 30 mins
In 1 min, it will fill = 1/30
Consider the leak as an outlet pipe, so
1/30 = 1/12 – [ in 1 min how much the outlet pipe leaks ]
= 1/12 – 1/30
= 5/60 – 2/60 = 3/60 = 1/20
Therefore, it will take 20 mins for the leak to empty the cistern
Ques:- A clock takes 9 seconds to strike 4 times. In order to strike 12 times at the same rate, the time taken is
A. 27 seconds
B. 29 seconds
C. 33 seconds
D. 36 seconds
Recent Answer : Added by Mad On 2021-11-22 17:29:36:
9 sec=4 times
x sec=12 times
x=(9*12)/4=27 sec
Ques:- 4 * 0.4 * 0.04 * 0.004 = ?
Recent Answer : Added by Ps On 2021-02-11 16:42:38:
0.000256
Ques:- What is the full form of UTI?
Recent Answer : Added by Lovish On 2022-08-14 16:39:35:
Urinary Tract Infection
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Ques:- A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good?
Recent Answer : Added by Mubeen Mahomed On 2021-08-28 11:27:12:
Can someone confirm that it is : 5/9 * 4/8 * 3/7 = 11.9% that you choose 3 good bulbs in a row
Ques:- Find out the wrong number in the series:
789, 645, 545, 481, 440, 429, 425
A. 429
B. 440
C. 481
D. 645
Recent Answer : Added by narendra On 2022-09-18 09:01:36:
b
Ques:- if length of a rectangle is incr by 20% and width is decr by 20% then area
Recent Answer : Added by Admin On 2020-05-17 11:59:46:
we know,
area=b*h
b gets increased by 20% i.e (b+0.20b)
h gets decreased by 20% i.e (h-0.20h)
rewriting the equation(area=b*h),
area=(b+0.20b)*(h-0.20h)
area=b(1+0.20)*h(1-0.20)
area=b(1.20)*h(0.80)
area=b*h*(1.20)*(0.80)
area=b*h*(0.96)
i.e new area=0.96 times the original area
if 100% was the original area,it has decreased to 96%
so,100%-96%= 4%
Ques:- A man engaged a servant on the condition that he would pay him Rs.710 and a uniform after a year service. He served only for 8 months and got Rs.460 and a uniform. Find the price of the uniform?
Recent Answer : Added by PRERNA SAHU On 2021-11-13 11:02:18:
ans=13.33
solution: (710/12)*8 – 460
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Ques:- The legendary king Midas possessed a huge amount of gold. He hid this treasure carefully: in a building consisting of a number of rooms. In each room there were a number of boxes; this number was equal to the number of rooms in the building. Each box contained a number of golden coins that equaled the number of boxes per room. When the king died, one box was given to the royal barber. The remainder of the coins had to be divided fairly between his six sons. Is a fair division possible in all situations?
Ques:- how many two digit numbers satisfy the property:the last digit of the sqr of the two digit number is 8
Recent Answer : Added by Admin On 2020-05-17 11:59:45:
ans: none
let it may be any number the square cant end in 8
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Ques:- A man loses 20% of his money and after spending 70% of the remainder he is left with Rs. 270. Originally he had?
Recent Answer : Added by Pablo On 2022-08-14 16:45:55:
0,8x= y
y – 0,7y = 270
y= 270 / 0,3
y=900
0,8x=900
x=1125
Ques:- After 25% increase price of article is 250 what is its price after 25% decrease ?
Recent Answer : Added by AKHIL On 2021-06-21 17:40:18:
Article price=200
After 25%increase =250
After 25% decrease =187.5
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Ques:- How is my father’s brother’s only sibling’s mother related to me ?
Recent Answer : Added by Akeel On 2022-08-14 18:01:09:
Grandma
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Ques:- A can swim & cross 50m(the length of swimming pool) in 2 min. B can swim & cross 50m in 2min 15sec. Every time when they meet a bell gong is struck. For 2000m how many bell sounds might be produced?
Recent Answer : Added by Admin On 2020-05-17 12:02:01:
If the bell rung when they r started is also counted then it
will be 5 otherwise 4
Ques:- Are you an out of the box thinker if yes please share some of the instances
Ques:- How many kilograms of sugar costing Rs. 9 per kg must be mixed with 27 kg of sugar costing Rs. 7 per kg so that there may be a gain of 10% by selling the mixture of Rs. 9.24 per kg?
A. 36 kg
B. 42 kg
C. 54 kg
D. 63 kg
Recent Answer : Added by narendra On 2022-09-18 09:02:18:
d
Ques:- The sum of three consecutive integers is 102. Find the lowest of the three?
Recent Answer : Added by Nicolae On 2021-09-22 16:55:53:
33
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Ques:- 40.83 x 1.02 x 1.2 = ?
Recent Answer : Added by Gowtham On 2022-09-15 16:37:20:
There should be 5(2+2+1) decimal places in the answer and the decimal place should end with 2(3*2*2=12) so the correct answer is a, no need for calculator. You can rule out all the other options because it does not satisfy this condition.
Time taken to fill repaired cistern = 12 mins
In 1 min, pipe will fill = 1/12
Time taken to fill cistern with leak = 12 + 18 = 30 mins
In 1 min, it will fill = 1/30
Consider the leak as an outlet pipe, so
1/30 = 1/12 – [ in 1 min how much the outlet pipe leaks ]
= 1/12 – 1/30
= 5/60 – 2/60 = 3/60 = 1/20
Therefore, it will take 20 mins for the leak to empty the cistern