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

A personn invested 10,000. The greater part is invested at 6% and the remainder at 5%. The annual income from the greater part is $160 more than the annual income form the smaller part. what is the smaller part of the the investment? What is the volume of a cube 4" high, 3" wide, 2" deep?