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12 June, 05:53

One number is 3 times a first number. A third number is 100 more than the first number. If the sum of the three numbers is 215, find the numbers.

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  1. 12 June, 06:12
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    23, 69 and 123

    Step-by-step explanation:

    let the first number be x then the second number is 3x (3 times the first) and the third number is x + 100 (100 more than the first number)

    The sum of the three numbers is

    x + 3x + x + 100 = 215

    5x + 100 = 215 (subtract 100 from both sides)

    5x = 115 (divide both sides by 5)

    x = 23

    The 3 numbers are

    x = 23, 3x = 3 * 23 = 69 and x + 100 = 23 + 100 = 123
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