Miss Grayson's class raised $50 for their field trip. Aside from that, each of her students contributed $5 each. There are 20 students in her class, and the cost of the trip is $7 for each student. After all the field trip costs were paid, how much is left in Miss Grayson's class fund?
The contribution of the students amounted to $5 x 20 = $<T>multiply(5, 20)=100
So Miss Grayson's class had $100 + $50 = $<T>add(100, 50)=150 in all.
The cost of the field trip amounted to $7 x 20 = $<T>multiply(7, 20)=140
Therefore, the class of Miss Grayson is left with $150 - $140 = $<T>subtract(150, 140)=10
