book Maths Puzzle Numerical Ability

The following is my problem:
A man has two more nickels than dimes. He has $1.15 in all. How many coins of each kind does he have. I know this looks simple but I cannot figure it out. I keep getting a negative number. Please help!

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book Other Question
complete the follwing equation "i" is an imaginary number using algebraic expressions.
(a+bi)(a-bi)=
(a+bi)^2-(a-bi)^2= can u give example of function applying it in real situation?