Question

If it took 8 men 10 hours to build a wall, how long would it take 4 men to build it?

Answer 1

Answer:

Step-by-step explanation:

8 men take 10 hours, so 4 men would take less hours.

This is indirect proportion.

So, let the time taken by 4 men be x.

Therefore,

8 *10=4*x

80=4x

X=80/4=20

Therefore,4 men will take 20 hours to finish the work.

Hope this helps you!

Answer 2

If it took 8 men 10 hours to build a wall, it would take 4 men 20 hours to build it.

Step-by-step explanation:

We use Unitary Method to solve the problem.

It took 8 men 10 hours to build a wall.

∴ it would take 1 man (8 × 10) hours = 80 hours to build the wall.

• Hint: since number of people is decreased, then the required time will increase

∴ it would take 4 men (80 ÷ 4) hours = 20 hours to build the wall.

• Hint: since number of people is increased, then the required time will decrease

Thus, if it took 8 men 10 hours to build a wall, it would take 4 men 20 hours to build it.

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