exam Maths Puzzle Numerical Ability

Stan invested $26,000, part at 11% and part at 8%. If the total interest at the end of the year is $2,560, how much did he invest at 11%?

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exam Other Question

Determine the maximum and minimum value of the following set of numbers.

3, -36/7, -1, -2/3, 5/4, -5, 26/9 A cough medicine contains 25% alcohol. How much liquid should a pharmacist add to 120 milliliters of the cough medicine so that it contains only 20% alcohol?