There are six children playing on a playground. Each child has two keychains. What is the ratio of children to keychains?

6 to 2
6 to 12
6:6
6 to 1

The ratio of children to keychains is 6 to 12.

The ratio of children to keychains is 6 to 12.

To find the ratio of children to keychains, we need to compare the number of children to the number of keychains. In this case, there are 6 children and each child has 2 keychains. So, the ratio of children to keychains is 6 to 2.