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4. A company makes two kinds of trading cards.
Regular cards are $0.40 each and premium
cards that cost $0.65 each. A box of 25 assorted
cards sells for $14. How many of each card type
are included?


Sagot :

value + value = 14 dollars
0.65x + 10-0.40x = 14
0.25x = 4
x = 16
25-x =9