Chain Rule Practice Test 2 with solutions

Question : 15 of 40

Marks: +1, -0

Carpenter A can make a chair in 6 hours,Carpenter B in 7 hours and Carpenter C in 8 hours. If each carpenter works for 8 hours per day, how many chairs will be made in 21 days?

Validate

Solution:

A’s one hour work =

1/6

B’s one hour work =

1/7

C’s one hour work =

1/8

Total work done together by three carpenters in 1 hour =

1/6 + 1/7 + 1/8

{28+24+21}/{168}

{73}/{168}

Number of chairs done in 8 hours =

{73}/{168} × 8

Number of chairs done in 21 days =

{73 × 8 × 21}/{168}

= 73 chairs

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