A farmer had 30 chickens. Some of them had 2 legs and some had 3.
Altogether the farmer counted 72 legs. How many chickens had 3 legs?
12
18
22
30

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There are a total of 30 chickens. Let's let x represent the number of chickens with 2 legs and y represent the number of chickens with 3 legs.

We know that each chicken has either 2 or 3 legs. So we can write the equations:
x + y = 30 (total number of chickens)
2x + 3y = 72 (total number of legs)

From the first equation, we can rewrite it as x = 30 - y and substitute it into the second equation:
2(30 - y) + 3y = 72
60 - 2y + 3y = 72
60 + y = 72
y = 12

Therefore, there are 12 chickens with 3 legs. Answer: 12