Quantity of strawberry picked up by students = 144 ounces
Let number of strawberry in pounds be 'x'
1 ounce = 0.0625 pound

Cross multiply
1x = 144(0.0625)
1x = 9
Divide both side by 1

x = 9
9 pounds of strawberries students will pick up to make 144 ounces of strawberry jam.