If we assume all thirty 4-wheel drive cars in the parking lot have their spare tire with them, how many tires are in the parking lot?
Each car has 4 tires + 1 spare = <<4+1=5>>5 tires
If there are 30 cars in the parking lot and each one has 5 tires, then the total number of tires is 30 * 5 = <<30*5=150>>150 tires
#### 150