exam Maths Puzzle Numerical Ability

Refer to a rectangle Find an expression that represents its perimeter
on top of the rectangle
___2x-1_
5
and on the side of the rectangle
__4___
3x+1

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exam Other Question
simplify the following, leaving the square root in its simplest form.

the square root of 5 the square root of 4 How much pure water must be mixed with 4 pints of 90% developer to produce a mixture that is 19% developer?