The ratio of doughnuts to muffins to cookies left over after the school play was 1:3:6. There were 42 cookies. How many desserts were there altogether?
The ratio of total desserts to cookies is \(10: 6 \).
We know that there are \(6 \times 7 = 42 \) cookies.
Now, we do the same thing to the desserts side.
Can you take it from here?