book Maths Puzzle Numerical Ability

For all real numbers a and b, where b does not equal 0, a*b= a squared over b squared , find (3*4)(5*3)

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book Other Question

The length of a rectangular garden is 2 ft less than 3 times its width. If the perimeter of the garden is 44 ft, find the dimensions of the garden? An investment is made at 8% compounded annually. It grows to $702 at the end of 1 year. How much was originally invested?