Answer:
He would need 1.5 cups of flour.
Step-by-step explanation:
In order to find the amount in the new recipe, start with creating a proportion. On the left side, put the ratio given. On the right, put the new one using x for the amount of flour.
3/4 = 2/x
Now cross multiply to solve
2 * 3 = 4 * x
6 = 4x
1.5 = x