Question 1127057
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120 children's hats at $4 each would have cost $480.  The actual total sales was $720, which is $240 more than that.<br>
Each adult's hat costs $3 more than each children's hat.  The number of adult's hats needed to be sold to make up that other $240 is 240/3 = 80.<br>
ANSWER: She sold 80 adult's hats and 120-80 = 40 children's hats.