Five times a number decreased by eight is at most ten more than twice the number

asked May 26, 2016 61.9k views

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$5n-8 \leq 2n+10 \\ 5n-8+8 \leq 2n+10+8 \\ 5n \leq 2n+18 \\ 5n-2n \leq 2n+18-2n \\ 3n \leq 18 \\ (3n)/(3) \leq (18)/(3) \\ n \leq 6$

Mark Bramnik answered May 31, 2016

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