If 1 oz equals 30 mL, how many milliliters are in 3 oz?

If 1 oz equals 30 mL, how many milliliters are in 3 oz?

• A. 30 mL
• B. 60 mL
• C. 90 mL
• D. 120 mL

Answer: (C)

When converting between units, use the given rate to scale the quantity. If 1 ounce equals 30 milliliters, then each ounce is 30 mL. Multiply the number of ounces by 30 to get milliliters: 3 oz × 30 mL/oz = 90 mL. The ounces cancel out, leaving milliliters. So 3 ounces is 90 milliliters. (For quick checks: 2 oz would be 60 mL, 4 oz would be 120 mL, so 3 oz lining up at 90 mL fits the pattern.)

When converting between units, use the given rate to scale the quantity. If 1 ounce equals 30 milliliters, then each ounce is 30 mL. Multiply the number of ounces by 30 to get milliliters: 3 oz × 30 mL/oz = 90 mL. The ounces cancel out, leaving milliliters. So 3 ounces is 90 milliliters. (For quick checks: 2 oz would be 60 mL, 4 oz would be 120 mL, so 3 oz lining up at 90 mL fits the pattern.)