Question : A can finish a work in 7 days. B can finish the same work in 9 days. The number of days required to finish the same work by both of them together is:
Option 1:
Option 2:
Option 3:
Option 4:
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Correct Answer:
Solution :
Given: A can finish a work in 7 days. B can finish the same work in 9 days.
LCM of 7 and 9 = 63
Let total work = 63 units
Now A's efficiency
B's efficiency
Total efficiency = (9 + 7) = 16 units
So, The number of days required to finish the same work by both of them together is
=
Hence, the correct answer is
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