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04-02-2018
Mathematics

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find 3 consecutive integers such that 3 times the sum of the first and third is 84 less than 12 times the secind

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Аноним Аноним

04-02-2018

Let x = 1st integer
x + 1 = 2nd integer
x + 2 = 3rd integer
3(x + x + 2) = 12(x + 1) - 84
3(2x + 2) = 12x + 12 - 84
6x + 6 = 12x - 72
-6x = -78
x = 13
Answer: 13, 14, 15

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