Question

20men can build a Wall in nine days then how long would it take 12 men to build the same wall

Answer 1

Step-by-step explanation:

20 men can build a wall in 9 days

1 man can build a wall in (20*9)= 180 days

12 men can build in 180/12 =15 days

Answer 2

Given :

• 20 men can build a Wall in nine days.

We Need To find :

• 12 men to build the same wall =?

Step-by-step explanation :

Let, 12 men to build the same wall be x day's

Thus, our table look like,

___________________________

| Number of men = 20 | 12 |

___________________________

| Number of Days = 9 | x |

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

Now, as the number of men is increases.

So, The total number of day's is also increases .

∴ It is case of inverse variation :

➮ 20 × 9 = 12 × x

➮ 12x = 20 × 9

➮ 12x = 180

➮ x = 180/12

➮ x = 15.

Therefore, 12 men to build the same wall in 15 day's.