Thirty students run in a charity race to raise money for the hurricane victims. Ten of the students raised $20 each. The rest of the students raised $30 each. How much did the students raise in all?
Ten students raised a total of $20 x 10 = $<T>multiply(20, 10)=200
There are 30 - 10 = <T>subtract(30, 10)=20 students who raised $30 each.
Twenty students raised a total of $30 x 20 = $<T>multiply(30, 20)=600
Therefore, the students raised a total of $200 + $600 = $<T>add(200, 600)=800
