During its first week of business, a market sold a total of 108 apples and oranges. The second week, five times the number of apples and three times the number of oranges were sold. A total of 452 apples and oranges were sold during the second week. How many more apples than oranges were sold in the first week?
a+o = 108
5a+3o = 453
2a = 129 ?? I suspect a typo
but a-o = 21