Question
Pipe ‘A’ can fill a tank in 30 hours whereas leak
‘A’ can empty it in 50 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 15 hours. How much time is needed to fill the given tank if pipe ‘B’ and leak ‘A’ work together?Solution
Let the capacity of the tank be 150 litres {LCM (30 and 50)} Efficiency of pipe ‘A’ = 150 ÷ 30 = 5 litres/hour Efficiency of leak ‘A’ = 150 ÷ 50 = 3 litres/hour Combined efficiency of pipe ‘A’ and leak ‘A’ = 5 – 3 = 2 litres/hour Combined efficiency of pipe ‘A’, ‘B’ and leak ‘A’ = 150 ÷ 15 = 10 units/hour Efficiency of pipe ‘B’ = 10 – 2 = 8 units/hour Time taken by pipe ‘B’ and leak ‘A’ to fill the tank = 150 ÷ (8 – 3) = 30 hours
?% of 320 = 40% of 40 × 5
{(481 + 426) 2 - 4 × 481 × 426} = ?
- What will come in place of the question mark (?) in the following questions?
(? × 3)2 - 85 = 115 × 5 + 69
What will come in the place of question mark (?) in the given expression?
? X √36 - 184 = 62 X 4
Solve the following equation.
143 + 14.3 + 1.43 + 0.143 + 0.0143 =?
If A = 0.84181818... then what will be the difference between the numerator and denominator of the lowest fraction form of A?
18% of 200 - 16% of 150 = ?
625 × (?% ÷ 125) = 250% of 10
36 × 15 + 20% 1250 = ? + 296
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