The surface area of a solid sphere is 1386 square cm. What is its volume in cubic cm? (Use π = 22/7.)

4π$r^2=1386$ gives $r^2=1386\times 7/88=110.25$, so $r=10.5$ cm. Volume = (4/3)π$r^3=(4/3)\times (22/7)\times 1157.625=4851$ cubic cm. The trap 1386 simply repeats the given surface area; 14553 uses 4π$r^3$, dropping the 3 in the denominator; 38808 is the volume for $r=21$ cm, taking the 10.5 cm as a diameter rather than a radius.