Question
Machine X is 100% more efficient than Machine Y, and
Machine Y is 75% more efficient than Machine Z. Machines X and Z, working together, can complete a certain task in 15 days. How many days will it take for Machines Y and Z, working together, to complete twice the amount of work, if Machine Z operates at only half of its normal efficiency?Solution
Let the efficiency of 'Z' be 4x units/day. So, efficiency of 'Y' = 4x X (7/4) = 7x units/day And, efficiency of 'X' = 14x units/day So, total work = (14x + 4x) X 15 = '270x' units Therefore, required time = (2 X 270x) ÷ (7x + 0.5 X 4x) = (570x/9x) = 60 days
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38, 44, 32, 50, 24, 56, 20
A series is given with two wrong terms. Select the wrong term in the given series.
32, 43, 58, 73, 92, 117, 144
5, 15, 30, 135, 405, 1215, 3645
Find the wrong number in the given series.
5, 3, 6, 17.25, 64.75
A series is given with one wrong term. Select the correct alternative from the given ones that will complete the series.
33, 44, 66, 110, 199, 374
Find out the Wrong number in the following number series.
2, 123, 204, 256, 278, 287
In this question, one term in the number series is wrong. Find out the wrong term.
130, 135, 143, 154, 168, 183, 205
In the following question, select the wrong number from the given alternatives.
52, 26, 26, 52, 208, 1644
Select the number from among the given options that is wrong in the following series.
22, 30, 46, 78, 146, 270
Select the wrong term in the series.
10, 19, 23, 52, 61, 133, 149
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