exam Maths Puzzle Numerical Ability

Simplify by combining like terms

2 sqrt (5x) + 5 sqrt (5x) - sqrt (5x)

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exam Other Question

Two airplanes leave Kennedy airport at 1pm. The air traffic controller reports that they are traveling away from each other at an angle of 103 degrees. The DC-10 travels at 509 mph How much water should be added to 30 gallons of a solution that is 70% antifreeze in order to get a mixture that is 60% antifreeze.

How do I go about setting up this equation? Please help!