exam Maths Puzzle Numerical Ability

If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80?

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exam Other Question

Bill is paid hourly. If he works 8 hours he will receive $50. Write an equation for his salary based on the number of hours he works. . find the minimum of the function:
-0.02x^3-5x^2+7900x-200000
and also you have to find the factor of this function.