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11
Answer:
135 days
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3
Answer:
The units of work done is man-days ie man*days. convert the work to be done in terms of man-days.
Total man-days for doing the work is 30 * 27 = 810 man-days.
For doing thrice the work will be 810 * 3 = 2430 man-days
The answer is 2430 / 18 = 135 days
once you understand, you can solve it in a single line 30*27*3 = 18 x
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