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Volume of a cone = PI * r^2 * h/3

Volume = PI * 3.9^2 * 5.3/3

Volume = 84.375 cubic cm

Volume of cylinder = PI*r^2 *h

Volume = PI * 3.9^2 * (18.1-5.3-3.9)

Volume = PI * 3.9^2 * 8.9

Volume = 425.06 cubic cm.

Volume of hemisphere = 2/3 * PI * r^3

Volume = 2/3 * PI * 3.9^3

Volume = 124.174 cubic cm.

Total volume = 84.375 + 425.06 + 124.174 = 633.61 cubic cms.

Volume of cylinder (7.7 – 5.3) = 2.4 cm high

  PI * 3.9^2 * 2.4 = 114.623 cubic cm.

Fuel 7.7 cm above vertex = volume of cone and volume of cylinder with fuel = 84.375 + 114.623 = 198.99 = 199 cubic cm.

Took 15 minutes, so 199 / 15 = 13.27 cubic cm per minute.

Fuel left to fill: 633.61 – 199 = 434.61 cubic cm

434.61 cubic cm / 13.27 cubic cm per minute = 32.75 minutes = 33 minutes left.

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: