exam Maths Puzzle Numerical Ability

A chemist has a 25% and a 50% acid solution. How much of each solution should be used to form 200 mL of a 35% acid solution?

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What is the slope of the line that runs through the points (0,32)(100,212)? A grapefruit beverage that is 45% concentrated juice is mixed with an orange beverage that is 75% concentrated juice to produce a blend that is 55% concentrated juice. How many gallons of each must be mixed to produce 200 gallons of the blend?