Question

It takes 5 men 5 hours to build 5 cars. How many hours does it take for 20 men to build 20 cars?

• A. 5 Hours
• B. 20 Hours
• C. 1 Hour
• D. 4 Hours

Answer 1

The correct option is A

5 Hours

5 men build 5 cars in 5 hours.

1 man builds 5 cars in 5 x 5 or 25 hours.

1 man builds 1 car in $\frac{25}{5}$ or 5 hours.

20 men build 1 car in $\frac{5}{20}$ hours.

20 men build 20 cars in $\frac{5\times 20}{20}$ hours = 5 hours.