exam Maths Puzzle Numerical Ability

4x-2x+7x=36

2x+7x=36
9x=36
9x/9=36/9
x=4

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exam Other Question

The length of a rectangle is 1 cm longer than its width. If the diagonal of the rectangle is 4 cm, what are the dimensions (the length and the width) of the rectangle?

Thanks for the help! i dont get it it tells me to solve by the substtitution method? please HELP!