a zoo, has just mammals & birds. When asked how many of each they have, the zoo keeper said he had 54 animals with 140 feet total between them all. Assuming all the animals have all the feet they should have, how many birds & how many mammals are there?
2007-07-09 01:31:25 · 7 answers · asked by G65puzzle 1 in Entertainment & Music ➔ Jokes & Riddles
How did you arrive at the answer ?
2007-07-09 01:48:06 · update #1
Let X be the number of mammals.
Let Y be the number of birds.
Then X+Y= 54 (the total number of animals)
This is our first equation.
Each mammal has 4 feet. Each bird has 2 feet.
So total number of mammal feet (4 times X) + total number of bird feet (2 times Y) = 140 (the total number of animal feet)
i.e. 4X + 2Y = 140 or, if we divide both sides by 2,
2X + Y = 70
This is our second equation.
Now, if we subtract our first equation from our second equation we get X = (70 - 54) = 16
Looking back to our first equation we can see that if X = 16
then Y = (54 - 16) = 38
So there are 16 mammals and 38 birds.
Now that wasn't difficult, was it?
2007-07-09 02:41:39 · answer #1 · answered by doshiealan 6 · 1⤊ 0⤋
mammals 16 birds 38
2007-07-09 12:12:28 · answer #2 · answered by kissypuppys 3 · 0⤊ 0⤋
16 mammals and 38 birds.
:)
2007-07-09 08:43:22 · answer #3 · answered by H 4 · 0⤊ 0⤋
16 mammals and 38 birds
.
.
.
.
.
I used a calculator . . . . otherwise known as
v v v v v
2007-07-09 08:38:41 · answer #4 · answered by billy b 3 · 0⤊ 1⤋
You cannot work this out, as you are assuming that all mammals have four feet, which is simply not true.
2007-07-09 08:51:12 · answer #5 · answered by Anonymous · 0⤊ 1⤋
It may depend on how many of the higher primates are in the zoo.
2007-07-09 08:36:24 · answer #6 · answered by Pat 5 · 0⤊ 0⤋
Who cares.
If you have a foot fetish you're well sorted!!!!!!!!!!!!
2007-07-09 08:45:56 · answer #7 · answered by jennijan 4 · 0⤊ 1⤋