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12 March, 13:31

A triangle has angles described as follows: the first angle is four more than seven times a number, another angle is four less than the first and the third angle is twice as large as the first. what are the sizes of each of the angles?

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  1. 12 March, 16:44
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    1st angle: 7x+4

    2nd: 7x+4-4=7x

    3rd: 2 (7x+4)

    180=7x+4+2 (7x+4) + 7x

    28x+12=180

    28x=168

    x=6
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