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A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?
- A21 ½ days
- B22 ½ days
- C23 ½ days
- D12 ½ days
Correct answer: A
Discussion 1
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CCommunity
21 ½ days
1/18 + 1/30 = 8/90 = 4/45
45/4 = 11 ¼ *2 = 22 ½ days
1/18 + 1/30 = 8/90 = 4/45
45/4 = 11 ¼ *2 = 22 ½ days