Sheep: cows: pigs=12: 3: 2. there are 150 more sheep than pigs. how many cows has she got?

Information Given: She has 12 groups of sheep, 3 groups of cows and 2 groups of pigs. Question asks: There are 150 more sheep than pigs. How many cows has she got?
They figured 150 more sheep than pigs from 2 pigs X 75 sheep=150 lambs of 12 groups of sheep.
150 lambs/3 groups of cows=50 cows.
She has 50 cows from 3 groups of cows.

Sheep (s) = pigs (p) +150
s=p+150
s=6p
6p=p+150
5p=150
p=30

there are 30 pigs
30/2=15
15*3=45

there are 45 cows

here's is a little bit so you know this is correct
30x6=180
180-30=150
there is a 150 difference between sheep and pigs.

Hope this helps :)