Question
Two taps can fill a cistern in 20 hours and 13 hours,
respectively. A third tap can empty it in 12 hours. How long will it take to fill the empty cistern, if all of them are opened together? ÂSolution
Let’s assume the total work (i.e., filling the cistern) is 1 unit .
- Tap A fills in 20 hours → Rate = 1/20
- Tap B fills in 13 hours → Rate = 1/13
- Tap C empties in 12 hours → Rate = −1/12 (since it removes water)
More Previous year papers Questions
(62 + 82 ) X ? = 80% of 500 - 25 X 4
What approximate value should come in the place of question mark in the following questions?
(49.6 × 19.8) ÷ 9.9 = ?
15 × 35 ÷7 + 60% of 300 =?
- What will come in place of the question mark (?) in the following questions?
7, 8, 12, 21, 37, ?
What will come in the place of question mark (?) in the given expression?
21 × 18 + ? – 19 × 15 = 25 × 24
16 × 14 + 30 × 21 = 14 × ?
(106 + 14)/15 = ?/5
Simplify the following expressions and choose the correct option.
[(13)² − (9)²] × (5/8) = ?
What will come in the place of question mark (?) in the given expression?
? = 12.5% of 25% of 20% of 1280 + 1248
