book Maths Puzzle Numerical Ability

I need help proving: If n = 3m + 1 for some integer m, then n is not divisible by 3.

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book Other Question

Simplify: -(-(-7)). A rectangular garden has dimensions of 18 feet by 13 feet. A gravel path of equal width is to be built around the garden. How wide can the path be if there is enough gravel for 516 square feet?