Question

20 mens can build a wall in nine days, then how long would it take 12 mens to build the same wall?

Answer 1

Answer:

15 days to build the same wall.

Step-by-step explanation:

20 men =9 days

1 man can take 220×9=180 days

so 12 man can take 180/12=15 days to build the same wall.

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Answer 2

$\sf\huge\bold{Answer:}$

Given :

Days in which wall is built by 20 men = 9

To find :

Days in which wall can be built by 12 men

Solution :

Days taken by 20 men = 9

Days taken by 1 men

$= \frac{9}{20}$

Days taken by 12 men

$= \frac{9}{20} \times 12$

$= \frac{12}{20 } \times 9$

${=}$$\displaystyle{\sf { \cancel{ \frac{12}{20} }}}$$\sf{× 9}$

$= \frac{3}{5} \times 9$

$= \frac{27}{5}$

In mixed fraction

$= 5 \frac{2}{5}$

In decimal expansion

$= 5.4$

Hence,the days taken by 12 men will be 5.4 days or 5 days and $\frac{2}{5}$th of the next day.