Question

A string of decorative lights is 25 feet long. The first light on the string is 16 inches from the plug. The lights on the string are spaced 4 inches apart. How many lights are there on the string?

Answer 1

25 feet = 25 x 12 = 300 inches

First light is at 16 inches.
300 - 16 = 284 inches

Find the rest of the bulbs:
284 ÷ 4 = 71

Total number of lights = 71 + 1 = 72

Answer  72 lights