book Maths Puzzle Numerical Ability

Mixing Antifreeze
A radiator holds 5 gallons of fluid. It is full with a 15% solution, how much fluid should be drained and replaced with 65% antifreeze mixture to result in a 40

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book Other Question

One number is 2 more than twice another. If the product of the numbers is 2 more than twice their sum, find the numbers. A cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist抯 average rate for the round trip in miles per hour?