Question

A string of decorative lights is 28 feet long. The first light on the string is 16 inches from the plug. If the lights on the string are spaced 4 inches apart, how many lights are there on the string

Answer 1

ans - 80

Explanation:

First thing is to convert everything to common units. Since the lights are 4 inches apart, using feet would be impractical, since 4 inches is 1/3 of a foot. Instead, convert the string length to inches:

28foot⋅12 inchfoot=336 inch

We know that the first light is 16 inches from the end, meaning the lights start at:

336−16=320 inches

Finally, we also know that there is a light every 4 inches, so we can divide the length by the length-per-light to get the number of lights:

320inches⋅1 light4inches=80 lights

Answer 2

Answer:

First thing is to convert everything to common units. Since the lights are 4 inches apart, using feet would be impractical, since 4 inches is 1/3 of a foot. Instead, convert the string length to inches:

28foot⋅12 inchfoot=336 inch

We know that the first light is 16 inches from the end, meaning the lights start at:

336−16=320 inches

Finally, we also know that there is a light every 4 inches, so we can divide the length by the length-per-light to get the number of lights:

320inches⋅1 light4inches=80 lights

Step-by-step explanation:

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