Posted by **trevor** on Monday, August 9, 2010 at 6:56pm.

the trainers took a count of the animals at the zoo. there are both birds and four legged mammals at the zoo. the trainers counted 550 feet and 155 animals on their first trip through. How many birds and mammals are there?

- math -
**Anonymous**, Monday, August 9, 2010 at 7:05pm
x=number of 2 legged birds

y=number of 4 legged mammals

2x+4y=550

if there are a total of 155 animals and you know the number of 2 legged birds, you could subtract the two and find the number of 4 legged mammals

therefore, let y=155-x

substitution:

2x+4(155-x)=550

solve for x. that is the number of 2 legged birds!

then plug x into y=155-x and that will be the number of four legged mammals

- math -
**Roger**, Saturday, December 22, 2012 at 7:19pm
15

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