Question

A and B together have to complete a piece of work consisting of 160 equal units. A can do (x + 2) units of work per day and B can do (x − 2) units per day. They complete the work together in 5 days. In how many days can A alone complete the entire work?

A 7(2/5) days
B 5(1/7) days
C 8(8/9) days
D 3(5/7) days
E None of these
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