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One number is 6 times a first number .a third is 100 more than the first number .if the sum of the three numbers is 708,find the numbers

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Say the first number is x, you would then have x and 6x and then x + 100. If you add all these together you get 8x + 100 = 708. You then subtract both sides by 100 and get 8x = 608. Divide both sides by 8 and you get 608/8 which = 76.
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