7. A and B can finish a work in 30 days. They
worked for it for 20 days and then B left. The
remaining work was done by A alone in 20 more
days. A alone can finish the work in
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Step-by-step explanation:
A+B's 20days work=1/30×20=2/3
remaining work= 1-2/3=1/3
now 1/3work is done by A in 20days
the whole work done by A = 20×3=60days
pls mark me as BRAINILIST answer pls
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