Chain Rule Practice Test 1 with solutions

Question : 31 of 40

Marks: +1, -0

20 men complete

1/3

rd of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days?

Solution:

Work	Days	Men
1/2	20	20
2/3	25	x

⇒

x/{20}

{20}/{25} × {2/3}/{1/3}

∴ x =

4/5 × 2 × 20

= 32
Hence, number of additional men = 32 – 20 = 12

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