book Maths Puzzle Numerical Ability

-10+(+3)= the possibilites are.........7, -13, -7, 13

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book Other Question

Jill has $12000 to invest. She invests 8% /a and the rest at 9% /a. After one year her interest is $1043. How much did she invest at each rate? Darrell has 2$ less than five times as much money as Bob. Mary has as much money as Darrell and Bob put together. If all three of them together have 80$, how many money does Mary have?