exam Maths Puzzle Numerical Ability

A rectangle has sides of 3x � 4 and 7x + 10. Find the expression that represents its perimeter.

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exam Other Question

I don't understand how to solve this problem. If you can cut the lawn in 2 hours, and your spouse can do it in 3 hours, how long would it take if you work together? What assumptions (if any) did you make to arrive at your solution?