Can you walk me through the solution of: A carton of ice cream contains 10 scoops each.  Mary has 3 cartons of ice cream, one chocolate, one strawberry and one vanilla.  Ethan wants one scoop of vanilla and one of chocolate.  Lucas, Danny and Connor all want 2 scoops of chocolate.  Olivia would like a scoop of vanilla and one of strawberry.  Shannon wants twice as much as Olivia.  How many scoops of ice cream will be left?