A is twice as good a workman as B and together they finish a piece of work in 14 days. A alone can finish the work in -

A 28 days

B 24 days

C 25 days

D 21 days

Solution

Correct Answer: Option D

মনেকরি,
B কাজটি করে 2x দিনে
∴ A কাজটি করে x দিনে

প্রশ্নমতে, 1/x + 1/2x = 1/14
(2+1)/2x = 1/14
3/2x = 1/14
2x = 42
x = 21
∴ A একাকী কাজটি করে 21 দিনে।

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