exam Maths Puzzle Numerical Ability

A 34% acid solution was mixed with a 66% acid solution to produce 216 liters of a 42% acid solution. How much liters of each solution was mixed?

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exam Other Question

Factor out the greatest common factor.

30x^4 -48x^2 +15x Helped by a strong jet stream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400km trip in 30 min. less time than usual. At what speed does the plane usually fly?