<human>:  Bubbles collects stuffed animals. She has three stuffed puppies, five stuffed koalas, two stuffed zebras and four stuffed frogs. If she wants to buy enough stuffed goats, such that the percentage of stuffed goats is 30% of all of her stuffed animals, how many stuffed goats should she buy?
<bot>: Define a variable ** Let x = the number of stuffed goats.
How many stuffed animals does Bubbles have? ** The current number of stuffed animals are (puppies + koalas + zebras + frogs) or 3 + 5 + 2 + 4 = <<3+5+2+4=14>>14 stuffed animals total.
How many stuffed goats should Bubbles buy? ** Take the total stuffed animals, add x and divide by the number of stuffed goats to get to 30% or x / (14 + x) = .3
How many stuffed goats should Bubbles buy? ** Cross multiply to get x = 0.42 + .3x
Simplify ** Subtract .3 x from each side, .7x = 0.42
How many goats does Bubbles need? ** Bubbles needs x = <<6=6>>6 goats added.
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