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?
Jerome bought 5 x 2 = <<5*2=10>>10 toy cars this month.
So he bought a total of 5 + 10 = <<5+10=15>>15 toy cars.
Therefore, Jerome had 40 - 15 = <<40-15=25>>25 toy cars originally.
#### 25