James decides to bulk up.  He weighs 120 kg and gains 20% of his body weight in muscle and 1 quarter that much in fat.  How much does he weigh now?
He gains 120*.2=<T>multiply(120, 0.2)=24.0 kg in muscles
So he gains 24/4=<T>divide(24, 4)=6.0 kg of fat
That means he gains a total of 24+6=<T>add(24, 6)=30 kg of bodyweight
So his new body weight is 120+30=<T>add(120, 30)=150 kg
