Answer: he will need 28 cups of dough for 3 cups of chocolate.
Explanation:
The baker uses 2 1/3 cups of cookie dough and 1/4 cup of chocolate chips to make 10 cookies. Converting 2 1/3 cups of cookie dough into improper fraction, it becomes 7/3 cups of cookie dough.
It means that for every 1/4 cup of chocolate, 7/3 cups of cookie dough is needed.
Let x represent the amount of cookie dough needed for 3 cups of chocolate chips.
If 7/3 dough = 1/4 cup of chocolate
x dough = 3 cups of chocolate
x × 1/4 =7/3 × 3
x/4 = 7
x = 7×4 = 28 cups of dough