exam Maths Puzzle Numerical Ability

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%?

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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 Solve the following equation for x:

5(x - 2)^2 = 3

Express your answer(s) in both "simplified radical" form, and in decimal form.

I came up with x=2+or-sqrt(3/5). Could someone please check this one for me. Thanks.