Johnny buys 15 packs of colored pencils for his class. Each pack has a red, yellow, and green pencil inside. When he gets home he notices that 3 of the packs have two extra red pencils inside. How many red colored pencils did Johnny buy?
Johnny bought 15 packs, and every normal pack has 1 red pencil. He should have 15 * 1 = <<15*1=15>>15 red pencils.
3 of the packs have 2 extra red colored pencils, so there are 3 * 2 = <<3*2=6>>6 extra red pencils.
In total, Johnny has 15 + 6 = <<15+6=21>>21 red colored pencils.
#### 21