Water to powder for lemonade is 5:2. If you use 15 cups water, how many cups powder?
On a trip, adults to students are 1:7. If 42 students attend, how many adults?
Markers to crayons are in a 4:1 ratio. If there are 20 markers, how many crayons?
A recipe needs sugar to flour 2:3. If 6 cups sugar, how many cups flour?