book Maths Puzzle Numerical Ability

The width of a rectangle is one third of the legnth. If the perimeter is 96, Find the width.

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book Other Question

Can you please show me how to work this problem out?

2a+b=14
3a+b+4

(this is one problem.)
Please help with this!

(x/x-9) - 4 = (9/x-9)

Thank you!!