Question
A work can be completed by ‘A’ and ‘B’, alone in
18 days and 10 days, respectively. Find the number of days taken by ‘C’ to complete the same work alone if ‘A’, ‘B’ and ‘C’ together can complete the whole work in 5 days.Solution
Let total work = 90 units (LCM of 18 and 10) Efficiency of ‘A’ = (90/18) = 5 units/day Efficiency of ‘B’ = (90/10) = 9 units/day Combined efficiency of ‘A’, ‘B’ and ‘C’ = (90/5) = 18 units/day Efficiency of ‘C’ = 18 – (5 + 9) = 4 units/day Required time taken = (90/4) = 22.5 days
Find the wrong number in the given number series.
7, 14, 29, 58, 117, 233, 469
3Â Â Â 4Â Â Â 18Â Â Â Â 72Â Â Â Â 360Â Â Â Â Â 2160Â Â Â
- 72, 102, 148, 200, 272, 362
12, 36, 41, 121, 128, 384
- Find the wrong number in the given number series.
8, 19, 12, 23, 16, 36 4, 5, 12, 39, 160, 806
Find the wrong number in the given number series.
1, 3, 10, 21, 64, 129, 356, 777
Find the wrong number in given number series.
1500, 1450, 1390, 1350, 1240, 1150
Find the wrong number in the given number series.
3, 7, 22, 89, 445, 267526, 38, 60, 110, 206, 398
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