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put this solution on YOUR website!Let the number of chocochip cookies sold be x.
As the number of peanut butter cookies sold is half the number of chocochip cookies sold by them and it is also given that the sum of both the cookies is 20 dozen.
So according to the question,
x+(x/2)=20*12
(3x/2)=240
3x=480
x=160
(x/2)=80