A group of people, cats, and birds have 70 legs, 30 heads, and 20 tails. How many cats are in this group?
+1005 There are a total of 30 animals, and 10 humans, since 30 -20 = 10.
There are 20 cats and birds, 70 - 10*2 = 50 legs, and 20 tails.
So 4c + 2b = 50
c + b = 50
If there are 10 cats, 10 birds, we have 40 + 20 legs
Too much. 8 cats 12 birds, 32 + 24 = 56 legs.
Each time we remove a cat and add a bird we have 2 less legs. 60-50 = 10, 10/2 = 5/
10-5 = 5cats, 15 birds.
20 + 30 = 50
5 cats
If you don't understand anything feel free to ask.
+1005 There are a total of 30 animals, and 10 humans, since 30 -20 = 10.
There are 20 cats and birds, 70 - 10*2 = 50 legs, and 20 tails.
So 4c + 2b = 50
c + b = 50
If there are 10 cats, 10 birds, we have 40 + 20 legs
Too much. 8 cats 12 birds, 32 + 24 = 56 legs.
Each time we remove a cat and add a bird we have 2 less legs. 60-50 = 10, 10/2 = 5/
10-5 = 5cats, 15 birds.
20 + 30 = 50
5 cats
If you don't understand anything feel free to ask.
