<human>:  Mike changes tires on different vehicles. He changes all the tires on 12 motorcycles and all the tires on 10 cars. How many tires did he change?
<bot>: How many motorcycle tires did Mike change? ** He changed 12*2=<<12*2=24>>24 motorcycle tires
How many car tires did Mike change? ** He changed 10*4=<<10*4=40>>40 car tires
How many tires did Mike change? ** So he changed 24+40=<<24+40=64>>64 total tires
#### 64