tape diagram for class

Question

Draw a tape diagram to show how you got answer.

Carlos has 3 times as many comedy movies as adventure movies. The total number of dvds are 68. How many comedy dvd does Carlos have?

Answer 1

How about this:

So, 51

Actually, making a tape diagram that had 4 sections, each 17 units long, would be better than what I have drawn above.

Answer 2

3a+a=68

4a=68

a=17

comedy=51