Question

A piece of work consists of 360 identical units. A can do (x + 4) units per day and B can do (x − 2) units per day. They work together for 9 days and the remaining work is completed by A alone in 5 more days. In how many days can B alone complete the entire work?

A 20 days
B 18 days
C 30 days
D 42 days
E None of these
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