2) A restaurant records the orders of a two course meal-deal of 72 diners. It consists of a main course and a dessert. 25 had Gateau, 12 of which previously had Pizza. Of
the 12 diners that had Salad, 2 followed that with Fruit and 2 followed it with Ice
Cream. 20 people had Pasta with Ice Cream and 4 people had Pizza with Fruit. Only
one person followed the Pasta with a portion of Fruit. How many people had Salad
with Gateau?