exam Maths Puzzle Numerical Ability

A 25% SOLUTION OF ALCOHOL IS TO BE MIXED WITH A 40% SOLUTION TO GET 50l OF A FINAL MIXTURE THAT IS 30% alcohol. How much of each of the original solution should be used?

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exam Other Question

The distance a car can travel on a certain amount of fuel varies inversely with its speed. If a car traveling 50 mph can travel 300 miles on 10 gallons of fuel, how far could the car travel on 10 gallons of fuel at 60 mph?

Thank you I have a mathematical modeling problem that I am having trouble solving. Please help.
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