If 1 quart equals 0.9 liters, how many quarts are in 18 liters?

If 1 quart equals 0.9 liters, how many quarts are in 18 liters?

• A. 18 quarts
• B. 22 quarts
• C. 20 quarts
• D. 19 quarts

Answer: (C)

The idea is converting units by using the given ratio and then checking with a quick multiplication to confirm. If each quart is 0.9 liters, the number of quarts in a certain number of liters is found by dividing the liters by 0.9. So for 18 liters, you compute 18 ÷ 0.9. Since 0.9 × 20 = 18, the division gives 20. A quick check: 20 quarts × 0.9 liters per quart = 18 liters, which matches. Therefore there are 20 quarts.

The idea is converting units by using the given ratio and then checking with a quick multiplication to confirm. If each quart is 0.9 liters, the number of quarts in a certain number of liters is found by dividing the liters by 0.9. So for 18 liters, you compute 18 ÷ 0.9. Since 0.9 × 20 = 18, the division gives 20. A quick check: 20 quarts × 0.9 liters per quart = 18 liters, which matches. Therefore there are 20 quarts.