Question

faldays
11. A and B can do a piece of work in 20 days. After A has worked for 15 days,
B finished the remaining work in 21 days. In how many days A alone can
do?
(a) 120 days (b) 130 days (c) 140 days (d) 150 days
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Answer 1

Step-by-step explanation:

120 days answer

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