Answer: 9/20
Step-by-step explanation: Maggi buys 3/4 pound of blueberries
He uses 3/5 of them to make a smoothie.
We need to find how many pounds of blueberries Maggi use to make the smoothie. It means we need to find 3/5 of 3/4. So,
So, he will use of blueberries to make a smoothie.