Answer:
15/28
Step-by-step explanation:
Let the number of berries Lisa picked be y
Number of berries she used to make pie = 2y/8 = y/4
Number of berries left = y - y/4 = 3y/4
Number of berries she gave her friend = 5/7 × 3y/4 = 15y/28
Fraction of the berries she gave her friend = 15/28