SOLUTION: Mark sold x pens for $2 each. He received less than $80 from the sale. Find the greatest possible number of pens he sold.

Question 1141719: Mark sold x pens for $2 each. He received less than $80 from the sale. Find the greatest possible number of pens he sold.
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.

The inequality is


    2x < 80  dollars.


Its solution is 


    x < 80/2 = 40.


Since the solution x must be integer number, its value is not greater than 39.


ANSWER.  The greatest possible number of pens he sold is 39.

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