Question 414115
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Hi
19 apples 
Let x and (19-x) represent the amount of the gala and smith apples respectively
Question states***
 .30x + .25(19-x) = $5.10
Solving for x
    .05x = 5.10-4.75
       x = .35/.05
       x = 7, the number of galas.  12 the number of smith apples

CHECKING our Answer***
   $2.10 + $3.00 = $5.10