###Human: Bob and Jim decide to skip rocks.  Bob can skip a rock 12 times.  Jim can skip a rock 15 times.  If they each skipped 10 rocks how many total skips did they get?, ### Assistant: Bob got 12*10=120 skips
Jim got 15*10=150 skips
So in total they got 120+150=270 skips 
 So the answer is :  270