Dave was playing checkers with a friend. The ratio of games Dave won was 7:2. If Dave won 35 games, how many games did his friend win?

His friend won 10 games.

Step-by-step explanation:

In order to find this, divide the number of games that he won by his part of the proportion (7).

35/7 = 5

5 in this case is the scale factor. We can now multiply his friend's winnings to get the total number of his wins.

5 * 2 = 10