###Human: John weighs 220 pounds when he starts exercising.  He manages to lose 10% of his body weight.  He then gains back 2 pounds.  How much does he weigh at the end?, ### Assistant: He lost 220*.1=22 pounds
So after gaining some weight back he was 22-2=20 pounds lighter than before
So his weight is 220-20=200 pounds 
 So the answer is :  200