Clay collected 7 times as many stamps as Terry. Terry collected half as many stamps as Skylar. Altogether, they collected 140 stamps. How many fewer stamps did Terry collect than Clay?
c = 7t
s = 2t
c + t + s = 140
7t + t + 2t = 140
t = 14
c = 98
c - t = 98 - 14 = 84
84 stamps Terry collected than Clay
+48 
