If one quart equals 0.9 liters, how many liters are in 4 quarts?

If one quart equals 0.9 liters, how many liters are in 4 quarts?

• A. 3.2 L
• B. 4.5 L
• C. 3.0 L
• D. 3.6 L

Answer: (D)

Converting units by scaling is the idea: you multiply the amount in liters per quart by the number of quarts. If 1 quart equals 0.9 liters, then 4 quarts is 4 × 0.9 liters, which equals 3.6 liters. So the amount in liters is 3.6 L. The other numbers wouldn’t come from this straightforward scaling (they’d require a different factor or a different quantity of quarts).

Converting units by scaling is the idea: you multiply the amount in liters per quart by the number of quarts. If 1 quart equals 0.9 liters, then 4 quarts is 4 × 0.9 liters, which equals 3.6 liters. So the amount in liters is 3.6 L. The other numbers wouldn’t come from this straightforward scaling (they’d require a different factor or a different quantity of quarts).