SOLUTION: Grimley had scores of 88,92,93, and 89 on his first four algebra tests. What score must he obtain on the fifth test to have an average better than 90 for the first five test?

Question 46955: Grimley had scores of 88,92,93, and 89 on his first four algebra tests. What score must he obtain on the fifth test to have an average better than 90 for the first five test?
Answer by aaaaaaaa(138) (Show Source): You can put this solution on YOUR website!
To calculate the average, we sum everything and divide (note that x is the fifth value, the unknown):

Solving an inequation is just like solving an equation, multiplying, adding, subtracting, dividing, on both sides. There are some special ocurrences, like having to invert the sign when you multiply by a negative number, but this one is simple.

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