book Maths Puzzle Numerical Ability

Please help me solve the following word problem. I am confused about what formula to use.

It costs $57.20 to frame a rectangular painting with a flat aluminum strip. This was c

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Mardi received an inheritance of $60,000. She invested part at 12% and deposited the remainder in tax-free bonds at 8%. Her total annual income from the investments was $6800. Find A rectangle is 4 times as long as it is wide. A second rectangle is 5 centimeters longer and 2 centimeters wider than the first. The area of the second rectangle is 270 square cent