book Maths Puzzle Numerical Ability

A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?

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book Other Question
5d-(d+3)=(d+2)+7 a container contains 8 liters of a mixture of water and salt. the mixture is 70% salt. how much pure salt must be added to make it 80% salt?