15% of the toddlers in a preschool class drink water with their lunch. how many toddlers are in the class if 3 drink water with their lunch? a. write a proportion for the situation. b. solve the problem. show your work. (a) (b)

Here's my best guess for how to go about solving this: 

15% = 15/100

so the proportion (part A) would be 

Next, to solve, just cross multiply. 


15x = 3(100)
15x= 300
15x/15 = 300/15
x= 20

So your answers are: 

A:
B: there are 20 toddlers in the class.