Question

A grain silo is built from two right circular cones and a right circular cylinder with internal measurements represented by the figure above. Of the following, which is closest to the volume of the grain silo, in cubic feet?

Answer 1

ANSWER EXPLANATION: The volume of the grain silo can be found by adding the volumes of all the solids of which it is composed (a cylinder and two cones). The silo is made up of a cylinder (with height 10 feet and base radius 5 feet) and two cones (each with height 5 ft and base radius 5 ft). The formulas given at the beginning of the SAT Math section:

Volume of a Cone

V=13πr2h

Volume of a Cylinder

V=πr2h

can be used to determine the total volume of the silo. Since the two cones have identical dimensions, the total volume, in cubic feet, of the silo is given by

Vsilo=π(52)(10)+(2)(13)π(52)(5)=(43)(250)π

which is approximately equal to 1,047.2 cubic feet.

The final answer 1047.2

Answer 2

ANS

D

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