exam Maths Puzzle Numerical Ability

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?

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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 The length of a golden retangle is approximately 1.6 times the width. Find the dimensions of a golden rectangle if its area is 9000m^2.