963 animals on a farm, 159 sheep and 406 cows and pigs. How many are pigs?

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963 animals on a farm, 159 sheep and 406 cows and pigs. How many are pigs?

Set up equation to represent the total animals on the farm
Total Animals = Cows + Pigs + Sheep

Now plug in what is given
963 = 406 + Pigs + 159

Simplify:
Pigs + 565 = 963

Subtract 565 from each side
Pigs = 398