2006-06-12 20:30:49 · 17 answers · asked by Anonymous in Education & Reference ➔ Primary & Secondary Education
Let us assume that ‘x’ be the number of cows ,
And ‘y’ be the number of chickens.
Now since the number of heads is 81,
So we can say that,
x + y = 81 ………………..Equation 1
Also The number of legs is 252. Since cow have 4 legs , therefore '4x ' and chicken have 2 legs , therefore '2x'
So we can say that,
4x + 2y = 252
or 2( 2x+y ) = (126)2
Cancelling ‘2’ both the sides ,
We get,
2x + y = 126 ………………..Equation 2
Now, subtracting Equation 1 from Equation 2.
We get,
2x + y = 126
x + y = 81
- - -
______________
x = 45
________________
Since,
x + y = 81 ………………..Equation 3
and also we get
x = 45
Subsituting the above value in Equation 3
WE GET,
y = 36
Answer- We get number of cows = 45
And number of chickens = 36
2006-06-13 00:59:13 · answer #1 · answered by Sanjana 2 · 0⤊ 0⤋
81 45 cows 36 chickens
2006-06-13 09:00:15 · answer #2 · answered by Maria 3 · 0⤊ 0⤋
Let Cows be X
Let Chicken be Y
Therefore,
X + Y = 81 (Given) (Equation 1)
Further,
4X + 2Y = 252 (Cows have 4 legs, Chicken have 2) (Equation 2)
Solving these two equations;
X + Y = 81 or 2X + 2Y = 192...(1)
4X + 2Y = 252...(2)
2Y is cancelled and 2X = 90
=> X = 45 = Number of Cows
Putting value of X in any equation, we get Y = 36
Therefore, cows are 45; Chicken are 36. (Answer)
2006-06-13 03:37:39 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Well, if you have 81 heads and 252 legs I would guess you are going to one heck of a feast :). But seriously now; you would have 45 cows and 36 chickens.
2006-06-13 03:53:52 · answer #4 · answered by Daydreamer 2 · 0⤊ 0⤋
There are 45 cows and 36 chickens
2006-06-13 03:58:45 · answer #5 · answered by lairlair211 2 · 0⤊ 0⤋
easy 45 cows and 36 chicken
Let say 'x' is th enumber of chicken
'y' th enumber of cows
1) Then x+y= 81
=> x=81-y
2) on legs
2x+4y= 252
=> x= 126-2y
use 1) & 2)
126-2y= 81-y
=> y=45
=> 45 cows
chinckens= 81-45, =>36 [sorry i did not put down the whole process but i guess it is understandable, nice question ]
2006-06-13 04:42:18 · answer #6 · answered by samydan 3 · 0⤊ 0⤋
36 chickens and 45 cows
2006-06-13 19:47:16 · answer #7 · answered by barbie6280 2 · 0⤊ 0⤋
45 cows and 36 chickens
2006-06-13 03:37:21 · answer #8 · answered by One2Som 2 · 0⤊ 0⤋
36 chickens and 45 cows
2006-06-13 03:35:34 · answer #9 · answered by Daniel O 2 · 0⤊ 0⤋
well hey i got this answer
47 * 4 legs as cows has = 188
34 * 2 legs as chicken has = 68
Total = 252 legs on 81 heads wich are 47 cows and 34 chickens =D
dont forget to pick your best answer :) whoever you pick gets 10 points :)
2006-06-13 03:43:43 · answer #10 · answered by america_2008_2008 3 · 0⤊ 0⤋