How many no of birds and animals ?

rengaraj · 2009-11-12T03:30:16+00:00

Sir / madam, My question is No. of animals is 11 more than the no. of birds. If the no. of birds were the no. of animals and no. of animals were the no. of birds (ie., interchanging no.s of animals and birds.), the total no. of legs get reduced by one fifth. How many no. of birds and animals were there Advance Thanks, R.Rengaraj {SCE 35/2008/Pg 4 of 85} {On this forum my 6th Question.}

How many no of birds and animals ?

rengaraj

Member

Updated: Oct 26, 2024

Views: 1.1K

Sir / madam,
My question is

No. of animals is 11 more than the no. of birds. If the no. of birds were the no. of animals and no. of animals were the no. of birds (ie., interchanging no.s of animals and birds.), the total no. of legs get reduced by one fifth. How many no. of birds and animals were there

Advance Thanks,
R.Rengaraj
{SCE 35/2008/Pg 4 of 85}
{On this forum my 6th Question.}

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sookie

Member • Nov 12, 2009

Is the answer is Birds =11 and Animals=22 ?

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yadavundertaker mohit

Member • Nov 12, 2009

let no. of animals = x
Let no, of birds = y

Acc to first condition

x=y+11

Acc to second condition

5(2x+4y )=4(4x+2y)

10x+20y=16x+8y
6x-12y=0

putting value of x from equation Ist

6(y+11)-12y=0
6y+66-12y=0
6y=66

y=11

then x=y+11

x=11+11=22

No. of animals =22
No of birds =11

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Guttu

Member • Nov 13, 2009

yadavundertaker
let no. of animals = x
Let no, of birds = y

Acc to first condition

x=y+11

Acc to second condition

5(2x+4y )=4(4x+2y)

10x+20y=16x+8y
6x-12y=0

putting value of x from equation Ist

6(y+11)-12y=0
6y+66-12y=0
6y=66

y=11

then x=y+11

x=11+11=22

No. of animals =22
No of birds =11
Nice explanation. I wonder how many of us apply what we learn?

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rengaraj

Member • Nov 13, 2009

Sir,
Thanks for your answer.
R.Rengaraj

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BigOhm

Member • Nov 14, 2009

Not to be overly pedantic, but aren't birds animals?

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gohm

Member • Nov 14, 2009

ha, yes and so are clams, fish and locust all of which would mess up the leg count. laugh. It is a good algebraic math puzzler though!

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