probability help

[jessi]

While visiting a daycare center, you estimate the ratio of toddlers to infants as 3:2. If the center has an enrollment of 25 children about how many of them are infants?

[JohnM]

Set this up as an algebra problem:

# toddlers = 3x
# infants = 2x

then 3x + 2x = 25
5x = 25
x = 5

substitute back in:

# toddlers = 3*5 = 15
# infants = 2*5 = 10

(check: 15 + 10 = 25)