There are deers and Peacocks in a zoo. By counting heads they are $80$ .The number of their legs is $200$ . How many peacocks are there .

20

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30

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60

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50

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Solution

The correct option is D $60$
Let number of deers $= x$
Number of peacocks $= y$
GIven $x + y = 80$
But deers have $4$ legs and peacocks have $2$ legs
So $4 x + 2 y = 200$
$2 x + y = 100$
Solving equations we get
$x = 20$ and $y = 60$
Number of peacocks $= 60$

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There are deers and Peacocks in a zoo. By counting heads they are 80 .The number of their legs is 200 . How many peacocks are there .

The correct option is D 60Let number of deers =xNumber of peacocks =yGIven x+y=80But deers have 4 legs and peacocks have 2 legsSo 4x+2y=2002x+y=100Solving equations we get x=20 and y=60Number of peacocks =60

There are deers and Peacocks in a zoo. By counting heads they are $80$ .The number of their legs is $200$ . How many peacocks are there .

The correct option is D $60$
Let number of deers $= x$
Number of peacocks $= y$
GIven $x + y = 80$
But deers have $4$ legs and peacocks have $2$ legs
So $4 x + 2 y = 200$
$2 x + y = 100$
Solving equations we get
$x = 20$ and $y = 60$
Number of peacocks $= 60$