A can complete a work in 20 days and B can do the same work in 30 days. Both A and B can complete the work together in ______ days.
- 15
- 10
- 12
- None of these
Explanation
To find the number of days A and B take to complete the work together:A's rate = 1/20 (work per day)
B's rate = 1/30 (work per day)
Combined rate = A's rate + B's rate
= 1/20 + 1/30
= (3 + 2) / 60
= 5/60
= 1/12
So, A and B together can complete the work in 12 days.
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- None of these
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