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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