exam Maths Puzzle Numerical Ability

i dont understand how to do this problem!! it involves letters and numbers being the exponent can someone help me out?? a^2m b^m+1 /(over) a^m b

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The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34in., find the dimensions of the rectangle. Colin invested $37,000, part at 16% and part at 3%. If the total interest at the end of the year is $3,320, how much did he invest at 16%?