exam Maths Puzzle Numerical Ability

A chemist needs to combine two solutions of a certain acid. How many liters of a 30% acid solution should be added to 40 liters of a 12% acid solution to obtain a final mixture that is 20% acid?

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exam Other Question

Divide an estate of 580 000 among four people in a ratio of 2:7:8:12. Suppose you deposit $20,000 for 3 years at a rate of 8%.
a) Calculate the return (A) if the bank compounds annually (n = 1).

b) Calculate the return (A) if the bank compounds q