exam Maths Puzzle Numerical Ability

what formula to use when the question states
"For a rectangle where the Perimeter=43cm and the Width=3.4cm, find the length"

also

"Find the Area formula to find the missing dimension of the following rectangle"
A=96m2, l=7.2m, w=?

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exam Other Question
Find the surface area of a right solid 8 in. high with the base shown as 10" and 4" and 10 in. Can someone help me solve this problem?

I need to find the mean of the following set of numbers:


12, 16, 19, 22, 28, 30

Thanks,
Sher