exam Maths Puzzle Numerical Ability

Help please I can not figure this out! Thanks so much.
The perimeter of a rectangle 48m. The length is 9m more than twice the width. What is the length please? Thank you for your help.

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exam Other Question

help me. please!

a highway patrolman spots a speeding car. he clocks it at 70 mph and takes after it .05 mile behind. if the patrolman travels at an average rate of 90 mph, how long before he over takes he car? Explain (a+b)^2 not equal to a^2 + b^2

give a numerial example to illustrate