human
Jerome bought 5 new toy cars last month. This month he bought twice as many so that he has 40 toy cars now. How many toy cars did Jerome have originally?
assistant
How many toy cars did Jerome buy this month? ** Jerome bought 5 x 2 = <<5*2=10>>10 toy cars this month.
How many toy cars did Jerome buy in total? ** So he bought a total of 5 + 10 = <<5+10=15>>15 toy cars.
How many toy cars did Jerome have originally? ** Therefore, Jerome had 40 - 15 = <<40-15=25>>25 toy cars originally.
#### 25