Aptitude - Simplification - Discussion
Discussion Forum : Simplification - General Questions (Q.No. 13)
13.
A man has some hens and cows. If the number of heads be 48 and the number of feet equals 140, then the number of hens will be:
Answer: Option
Explanation:
Let the number of hens be x and the number of cows be y.
Then, x + y = 48 .... (i)
and 2x + 4y = 140 
x + 2y = 70 .... (ii)
Solving (i) and (ii) we get: x = 26, y = 22.
The required answer = 26.
Discussion:
67 comments Page 1 of 7.
Jyothi said:
1 decade ago
Any short cut?
Srinu said:
1 decade ago
Can anyone tell me, how 2x and 4y are comming?
Deepi said:
1 decade ago
Hens have 2 legs and cows have 4 legs. So in-order to calculate number of hens and cows take as 2x+4y.
Sarthak said:
1 decade ago
Why haven't they count the head and feet of the man?
It should be:-
1+x+y = 48.
x+y = 47 ---- (1).
And 2+2x+4y = 140.
=> 2x+4y = 138 ---- (2).
By solving no.of hens (x) is 25.
It should be:-
1+x+y = 48.
x+y = 47 ---- (1).
And 2+2x+4y = 140.
=> 2x+4y = 138 ---- (2).
By solving no.of hens (x) is 25.
Sk.Gopinath Siva said:
1 decade ago
They asked only for number of hens?
Dhanalakshmi said:
1 decade ago
How x=26 and y=22 are coming?
Kaushlendra singh said:
1 decade ago
Let no.of hens = x.
So no.of cows = 48-x.
Therefore,
2x + 4*(48-x) = 140.
=> -2x = 140 - 192.
=> -2x = -52.
=> x = 26.
So no.of cows = 48-x.
Therefore,
2x + 4*(48-x) = 140.
=> -2x = 140 - 192.
=> -2x = -52.
=> x = 26.
HRISHIKESH PAWAR said:
1 decade ago
How to simplify 2x+4y = 140?
Sandip said:
1 decade ago
Why they are taking 2x+4y = 140, and the equation remains that x+2y = 70? Kindly simplify.
Prasad said:
1 decade ago
Case 1:
The number of heads = 48;
He has some hens (let hens as x) and cows (let cows as y) so each has head.
So we can take it as x+y = 48.
Case 2:
The number of feet equals to 140.
Hen has 2 legs and cows has 4 legs so 140 we can write as,
2x+4y = 140.
By solving this we will get result as x = 26; y = 22.
The number of heads = 48;
He has some hens (let hens as x) and cows (let cows as y) so each has head.
So we can take it as x+y = 48.
Case 2:
The number of feet equals to 140.
Hen has 2 legs and cows has 4 legs so 140 we can write as,
2x+4y = 140.
By solving this we will get result as x = 26; y = 22.
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