book Maths Puzzle Numerical Ability

How would i find the answer to 5.04+7.1 ? Please show the work

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book Other Question

perimeter of a rectangle is 22 inches and its length is 4 inches less than twice its width. Set up a system of linear equations and solve to find the dimensions of the rectangle. The length of a rectangle is 8 inches greater than its width. Find the width of the rectangle if its area is 105 square inches.
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