Answer:
40
Step-by-step explanation:
Batches of apples produced in one hour = 35/100 = 0.35
Batches of peaches produced in one hour = 70/100 = 0.70
total hours it would take to produce 15 batches of apples = 15 / 0.35 = 42.86 = 43 hours
this would leave (100 - 43) 57 hours to make peaches
Batches of peaches that can be made in 43 hours = 57 x 0.7 = 39.9 = 40 batches