book Maths Puzzle Numerical Ability

evaluate the expression

5+x+(-3)for x=-2

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book Other Question

Can you please help to answer the following question:
.
Find all pairs of positive integers x and y that satisfy the equation:
1/x - 1/y = 1/2005 An investment made at 9% compounded annually, grow to $926.60 at the end of 1 year. How much was orginally invested?