Final answer:
Doug has 85 baseball cards.
Step-by-step explanation:
To find the ratio of baseball cards to football cards, we can use the information given that Doug has 5 baseball cards for every 4 football cards. This can be represented as:
Baseball cards : Football cards = 5 : 4
Now, we can solve for the number of baseball cards when the number of football cards is given. If Doug has 68 football cards, we can set up the following proportion:
5 : 4 = B : 68
Solving for B, the number of baseball cards, we have:
B = (5/4) * 68
B = 85
Therefore, Doug has 85 baseball cards.