exam Maths Puzzle Numerical Ability

Sam earned 1155 in interest on a total investment 15000 this past year, if part of the money was invested at 6% and the remainder at 9% how much was invested at 6%

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exam Other Question
When the smaller of two consecutive even integers is added to three times the larger, the result is 31. sketch a graph of the fuction.

1. Y=1/x-3
2. Y=(1/x+1)+1