The curved surface area of a right circular cylinder is 1320 square cm and its height is 15 cm. What is its volume in cubic cm? (Use π = 22/7.)

2π$rh=1320$ gives $2\times (22/7)xrx$ 15 = 1320, so $r=1320\times 7/660=14$ cm. Volume = π$r^{2}h=(22/7)\times 196\times 15=9240$ cubic cm. The trap 2310 halves the 14 to 7, treating the radius found as a diameter; 36960 comes from solving π$rh=1320$ with the 2 dropped, which gives $r=28$ cm; 18480 carries the 2 of the curved-surface formula into the volume, using 2π$r^2$$h$.