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18 August, 12:44

The three numbers that make up the code to a safe sum 91. The last number is a multiple of 3, the middle number is 1/3 the last number, and the first is 3 times the last number. What is the middle nimber of the code?

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  1. 18 August, 16:15
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    7

    Explanation:

    Let the middle number be x.

    Since the middle number is 1/3 the last number, then the last number has to be three times the middle number,

    Therefore the last number is 3x

    The first is 3 times the last number, meaning the first number has to be 3*3x=9x

    All the three number add up to 91,

    thus 9x+x+3x=91

    13x=91

    x=91/13=7
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