exam Maths Puzzle Numerical Ability

You have 40 gallons of 20% solution. How Much 8% soultion do you need to add to get some 12% solution? How much solution will you have then?

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formula for arc of a baseball h=-0.003x2(to 2nd power)+ 1.202x + 3.936

h-height of ball at distance from plate x If fence is 400ft from home plate and 8ft high, will the ball clear the fence to be a home run?

Thank You in Advance Light travels through space at a constant speed of about 3*10^5 km/s. Sunlight reflecting from the moon takes about 1.28*10^0s to reach Earth. Find the distance from the moon to the Earth.