Question
Pipe ‘A’ can fill a tank in 27 hours. Pipe ‘B’
can empty it in 54 hours. If both are opened simultaneously, in how many hours will 66.67% of the tank be filled?Solution
Let the capacity of the tank be 108 litres. So, efficiency of pipe ‘A’ = 108 ÷ A = 4 litres/hour And efficiency of pipe ‘B’ = 108 ÷ B = 2 litres/hour So, combined efficiency of both pipes = 4 – 2 = 2 litres/hour So, time taken to fill 66% of the tank = (108 × 0.67) ÷ 2 = 72 ÷ 2 = 36 hours
Select the wrong term in the series.
10, 19, 23, 52, 61, 133, 149
5, 15, 30, 135, 405, 1215, 3645
3. 8, 15, 24, 34, 48, 63
In the following question, select the wrong number from the given alternatives.
48, 50, 52, 57, 59, 68, 75
Find the wrong number in the following number series:
2500, 1000, 400, 160, 60
Select the wrong term in the series.
44, 47, 41, 50, 38, 53, 40
Find the wrong number in the series given below.
5, 16, 50, 157, 463, 1394
8, 20, 48, 108, 232, 482
Identify the letter-cluster that does not belong to the following series.
RBK, TYM, VVO, XSP, ZPS, BMU
Select the number from among the given options that is wrong in the following series.
22, 30, 46, 78, 146, 270
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