exam Maths Puzzle Numerical Ability

A rectangle is 5 times as long as it is wide. If the area is 125 square feet, find its perimeter.

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exam Other Question

Telephoto lens. Use the formula 1/F=1/O + 1/I to find the image distance I for an object that is 2,000,000 mm from 250 mm telephoto lens. I don't understand the monomials or the negative exponents