Question

15 men can do a piece of work in 36 hours how many men will be required to finish the work in 20 hours​

Answer 1

Answer:

20×15 150

———— = ———— = 8.33333........

36 18

Answer 2

Answer:

Let the number of mens required be y .

Less time = More men required

Hence, It is a case of indirect proportion .

∴ Ratio of mens :: Inverse ratio of time

⇒    15 : y   :: 20 : 36

⇒ 15 × 36  = 20 × y

⇒     540   = 20 × y

⇒ 540/20 = y

⇒    27      = y

∴ 27 mens are required to to do the work in 20 hrs .

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