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30 December, 04:09

A string of decorative lights it's 28 feet long. The first light is 16 inches from the plug. If the lights are spaced 4 inches apart. How many lights are in the string?

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  1. 30 December, 06:56
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    Because the spacing is in inches, the total length of the string is 28 * 12 = 336 inches long

    subtract the distance to the first light: 336 - 16 = 320 inches left

    the spacing is 4 inches so now you would divide the length by the spacing to get the quantity of lights:

    320 / 4 = 80 lights
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