SOLUTION: Thad has scores of 87, 83, and 80 on his first three algebra tests. What score must he get on the fourth test to have an average of 82 or higher for the four tests?

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Let x=score of fourth

Remember, the average of the scores is simply the sum of the scores divided by the number of tests taken. So our inequality looks like this:




Multiply both sides by 4



Combine like terms on the left side


Subtract 250 from both sides


Combine like terms on the right side

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Answer:
So our answer is


So he needs at least a 78 to have an average of 82 or higher