Chain Rule Practice Test 2 with solutions

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Question : 23 of 40

Marks: +1, -0

If 30 men working 7 hours a day can do a piece of work in 18 days, in how many days will 21 men working 8 hours a day do the same piece of work?

20
$22 1/2$
25
30

Solution:

Men	Hours	Days
30	7	18/td>
21	8	x

⇒

x/{18}

=

7/8 × {30}/{21}

∴ x =

7/8 × {30}/{21} × 18

=

{45}/2

=

22 1/2

days

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