SOLUTION: A student buys some pens for 400$. If the cost of each pens is 9$ less, he can buy 9 pens more from the same money. Find the number of pens
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Question 993318: A student buys some pens for 400$. If the cost of each pens is 9$ less, he can buy 9 pens more from the same money. Find the number of pens
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the number of pens
Multiply both sides by
Use quadratic formula
The student bought 16 pens
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check:
OK
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