d) 48
step-by-step explanation:
16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,256,272,288,304,320,336
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
29933333.33