SOLUTION: Write an inequality or an equation and use it to solve the problem. During the first four months of the year, Jack earned $710, $990, $670 and $730. If Jack must have an average

Question 326509: Write an inequality or an equation and use it to solve the problem.
During the first four months of the year, Jack earned $710, $990, $670 and $730. If Jack must have an average salary of at least $720 in order to earn retirement benefits, what must Jack earn in the fifth month in order to qualify for benefits?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

If he needs an average of 720 per month for 5 months, then the sum of the 5 months salaries must be 720 times 5 = 3600. Add up the amounts he earned in the first 4 months and subtract that sum from 3600. The difference will be the amount he needs to earn in the fifth month.

John

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