Maths / Direct and Inverse Variation / Inverse Variation

QUESTION

30 men can finish a work in 28 days. How much time will be taken by 21 men, to finish the same work ?

 OPTIONS A. 30 days B. 33 days C. 38 days D. 40 days
Right Option : D

EXPLANATION
Explain TypeExplanation Content
Text

Using inverse variation

30 X 28 = 21 X x

$x=\frac{840}{21}=40$

x = 40 days

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