<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?
<bot>: How many of his soccer balls don't have holes? ** Matthias has 40-30 = <<40-30=10>>10 soccer balls without holes.
How many of his basketballs don't have holes? ** Matthias has 15-7 = <<15-7=8>>8 basketballs without holes.
How many balls in total does Matthias have without holes in them? ** A total of 10+8 = <<10+8=18>>18 balls do not have holes.
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