Three adults and four children must pay $159. Two adults and three children must pay$112. Find the price of an adult's ticket, and find the price of a child's ticket.
3A+4C=159
2A+3C=112
This is the same as the question that I just answered
http://web2.0calc.com/questions/solve-3a-4c-159-2a-3c-112
+20 
