exam Maths Puzzle Numerical Ability

how many liters of a 45% salt solution should be mixed with 9 liters of a 35% salt solution to make a solution that is 36% salt? round to the nearest hundredth

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exam Other Question

Solving combined inequalities
2 is less than y plus 6/2 is less than 5
AND
(4-y is less than 5 OR 4+y is less than 7) On an achievement test, ninth graders averaged 93% and eigth graders averaged 75%. A total of 90 students took the test and averaged 87%. How many ninth graders took the test?