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Sticky Note
If 15 men can do a work in 12 days, how many men will do the same work in 6 days?
  1. 20
  2. 24
  3. 25
  4. 30
Explanation

Let the required number of men be x.

Number of men15x
Number of days126

As number of men [M] will increase, the number of days [D] to finish a work will be less.
Hence, it is a case of inverse proportion.
⇒MD=constant
⇒M1D1=M2D2

[1 mark]

⇒15×12=x×6
⇒x=15×126=30

Therefore, the required number of men to finish the work in 30 days is 30 men.

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