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

## Answer This Question

## Related Questions

- math - In a zoo, 21% of the animals are reptiles and 11% are birds. There are a ...
- math - At a zoo, 1/3 of the animals are birds, 4/9 are mammals, and the rest are...
- algerbra - sasha researched the size of zoos in her state. she found that the ...
- Opinion, I need many people to respond - There has been a lot of controversy ...
- Science/zoology - What is the pacing behavior of caged zoo animals called? Last ...
- Math - There are 1,500 animals living at the zoo.15% of the animals have ...
- English - Which sentence is puncuated correctly? A.) Dogs cats and hamsters are ...
- LA - In which statement is the technique "supporting facts and examples" being ...
- algebra - For every dime spent, Sam receives 15 food pebbles to feed the animals...
- Math - If it costs an average of $14 each day to feed each of the 1058 zoo ...

More Related Questions