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

5 Hours

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20 Hours

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1 Hour

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4 Hours

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Solution

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.

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

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 255 or 5 hours. 20 men build 1 car in 520 hours. 20 men build 20 cars in 5×2020 hours = 5 hours.

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.