Question
A contractor hires 12 workers to complete a project in
20 days. After 8 days, 4 more workers are employed, and the project is completed 2 days earlier. How many days would it have taken if only 12 workers were employed?Solution
Work done in 8 days by 12 workers = 8 × 12 = 96 units. Remaining work = Total work - 96 = (12 × 20 - 96) = 144 units. New workers = 12 + 4 = 16 workers. Time taken by 16 workers = 144/16 = 9 days. If only 12 workers were employed, time = (96 + 144)/12 = 20 days. Correct answer: c) 20 days
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
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