book Maths Puzzle Numerical Ability

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?

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book Other Question

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? How long would it take and SR71 blackbird to travel 5570 miles, if it travels at an average speed of 2228 mph?