There were 30*.5=<<30*.5=15>>15 ounces of unburnt steak

So he ate 15*.8=<<15*.8=12>>12 ounces of steak

# Answer

12
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
12
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?
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