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6 September, 23:11

Four times a number is 21 more than the number. What is the number?

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  1. 6 September, 23:39
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    Let the number be x.

    Four times a number is 21 more than the number

    ⇒ 4x = 21 + x

    Solve x:

    4x = 21 + x

    Subtract x from both sides:

    3x = 21

    Divide both sides by 3:

    x = 7

    Answer: The number is 7.
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