human
John's grill messes up and burns half his steak. He eats 80% of what isn't burned. If the steak was originally 30 ounces how much steak did he eat?
assistant
How many ounces of steak were there? ** There were 30*.5=<<30*.5=15>>15 ounces of unburnt steak
How many ounces of steak did John eat? ** So he ate 15*.8=<<15*.8=12>>12 ounces of steak
#### 12