Question

19. 20 men can do a work in 20 days. How many more men are needed to complete the
work in 5 days?​

Answer 1

Explanation:

Let the required number of men be x.

Number of men ㅤ ㅤ20 ㅤ ㅤx

Number of days ㅤ ㅤ20 ㅤ ㅤ 5

More the number of men, less the number of days required. Therefore, this is a case of inverse variation

By inverse variation xy = k,

$20 \times 20 = x \times 5$

$x = \frac{20 \times 20}{5}$

$x = 20 \times 4$

$x = 80$

Therefore, 80 men are required to finish the work in 5 days.

Answer: 80 men

I hope this helps. :D