exam Maths Puzzle Numerical Ability

Please solve the problem.

The length of a rectangular frame is 5 cm more than the width. The area inside the frame is 66 square cm. Find the width of the frame.

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exam Other Question

F(X)=

2X
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X^2+16

FIND ALL VERTICAL AND HORIZONTAL ASYMPTOTES My question is combination word problem and cost function. I struggle a lot with these. Please assist.
In the following, a cost function is given. Find the average cost per item