3 years ago in Time and Work

# A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

[A] 23 days
[B] 37 days
[C] 37 <sup>1</sup>/<sub>2</sub> days
[D] 40 days

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