exam Maths Puzzle Numerical Ability

3(3s+7)=-(8-s) can you show me how to check it

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exam Other Question

Find the area of a regular octagon with an apothem 13.3 feet long and each side 11 feet long Chris cuts half a rectangle lawn, 40m by 30m, by mowing strips of equal width around the perimeter. Jonah cuts the small rectangle left. How wide a strip does Chris cut so that they share the work equally?