Question

Six men can build a 150 m wall in ten hours. How many are needed to build a 200 m wall in four hours

Answer 1

Answer:

The number of men who can build 200 m wall in 4 hours is 20 .

Step-by-step explanation:

Given as :

6 men can build a 150 m wall in 10 hours.

Let x men can build a 200 m wall in 4 hours.

According to question

$\dfrac{men\times days}{work}$   = constant

i.e $\dfrac{m_1\times d_1}{w_1}$ = $\dfrac{m_2\times d_2}{w_2}$

Or, $\dfrac{6\times 10}{150}$ = $\dfrac{x\times 4}{200}$

Or, 6 × 10 × 200 = x × 4 × 150

Or, 12000 = 600 x

∴   x = $\dfrac{12000}{600}$

i.e  x = 20

So, The number of men = 20

Hence, The number of men who can build 200 m wall in 4 hours is 20 . Answer