exam Maths Puzzle Numerical Ability

How much pure water must be mixed with 5 pints of 50% developer to produce a mixture that is 35% developer?

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exam Other Question

The volume of a can of soup is 144 PI inches cubed. The radius of the can is 6 inches. What is the height of the can? A person drove 234.8 miles and used 12.6 gallons of gas. Estimate the number of miles the car gets per gallon.