Question
Pipe E can fill a tank in 40 minutes while pipe F can
fill the same tank in 50 minutes. If pipe E and F are opened simultaneously, then after how much time must pipe E be closed so that the whole tank is filled in 25 minutes?Solution
ATQ, Let the capacity of the tank = 200 liters (LCM of 40 and 50). Quantity of water filled by pipe E in one minute = 200 / 40 = 5 liters. Quantity of water filled by pipe F in one minute = 200 / 50 = 4 liters. Let pipe E be closed after ‘x’ minutes. So, 5x + 4 × (25 – x) = 200 5x + 100 - 4x = 200 x = 100 x = 100/1 x = 100 So, pipe E must be closed after 100 minutes.
- (47.99/39.02) ÷ (11.99/12.99) X (143.99/47.87) ÷ (13.99/55.99) = ?²
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
44.89% of 1199.78 + 319.68 = ? × 42.79
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
? = 25.08 + 11.99 × 24.07
14.742 ÷ 24.98 × 15.76 = ?% of 359.88
74.99 x 175.01 - 75.12 x 154.98 + + 39.98) x 3.98 = (785.01 + 265.01) x 1.99
Monthly income of P is Rs.10000 and his monthly savings is Rs.2200. If his monthly income is decreased by 30% and monthly expenditure is decreased by 20...
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
