There were 37 jellybeans in a jar. Pat removed 15 of them. Pat then added 5 of the removed jellybeans back in, and then removed 4 more. How many jellybeans are now in the jar?
After removing 15 jellybeans, there were 37-15=<T>subtract(37, 15)=22 jellybeans in the jar.
After adding back 5 jellybeans, there were 22+5=<T>add(22, 5)=27 jellybeans in the jar.
After removing 4 more jellybeans, there were 27-4=<T>subtract(27, 4)=23 jellybeans left in the jar.
