Question

12 men can build a wall 100 metres long, 3 metres high and 0.5
meter thick in 25 days. In how many days will 20 men build a
wall 60 metres long, 4 metres high and 0.25 metres thick?
a. 3 days b. 12 days c. 6 days d. 8 days​

Answer 1

Answer:

6

Step-by-step explanation:

Given 12 men can build a wall 100 metres long, 3 metres high and 0.5

meter thick in 25 days. In how many days will 20 men build a

wall 60 metres long, 4 metres high and 0.25 metres thick?

We need to find the number of days to build a wall.

So let M be men and D for days.

W1 and W2 are volume of wall to be constructed, since amount of work done is volume of wall built.

We know that

M1D1 / W1 = M2D2 / W2

12 x 25 / 100 x 3 x 0.5 = 20 x D1 / 60 x 4 x 0.25

2 = D1 / 3

D1 = 6 days

Answer 2

Answer:

c. 6 days

Step-by-step explanation:

We know the formula,

N1.D1 / W1 = N2.D2 / W2

Where, N - no of men

D - no of days

W - work done

,