What is the average of 12, 18, 24, and 30?

(12+18+24+30) ÷ 4 = 84 ÷ 4 = 21.

A wire is 12 feet long and cut into 8-inch pieces. How many pieces result?

12 ft = 144 in; 144 ÷ 8 = 18 pieces.

1,800 RPM = 30 per second; 30 × 90 = 2,700.

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A tank holds 480 liters and drains at 16 liters per minute. How long until empty?