Mathematics
Medium
Question
A and B can finish a work 30 days if they work together. They worked together for 20 days and then B left. A finished the remaining work in another 20 days. In how many days A alone can finish the work?
A
70
B
50
C
40
D
60
✓ Official correct answer
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A
70
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B
50
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C
40
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D
60
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