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Chain Rule Practice Test 2 with solutions
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© examsnet.com
Question : 15
Total: 40
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?
79
73
67
61
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
© examsnet.com
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