Which number sentence below matches this word problem? Two brothers both had soccer games in the month of September. The older
played on the varsity team and had 12 games. The younger played on the
junior high team and had 9 games. What is the total number of games the
two brothers had in September?*
12 - 9 = 3
12 + 9 = 21
12- 3 = 9
21 - 9 = 12