Human: Matthias has 40 soccer balls and 15 basketballs. 30 soccer balls and 7 basketballs have a hole in them. How many balls in total does Matthias have without holes in them? Assistant:
Matthias has 40-30 = 10 soccer balls without holes.
Matthias has 15-7 = 8 basketballs without holes.
A total of 10+8 = 18 balls do not have holes.