There are deer 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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50

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60

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Solution

The correct option is D $60$
Let $x$ and $y$ be the number of deer and peacocks in the zoo respectively. Then,
$x + y = 80$ ...(i) and
$4 x + 2 y = 200$ or $2 x + y = 100$ ...(ii)
Solving (i) and (ii), we get $x = 20$ , $y = 60$ .

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There are deer 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 x and y be the number of deer and peacocks in the zoo respectively. Then,x+y=80 ...(i) and4x+2y=200 or 2x+y=100 ...(ii)Solving (i) and (ii), we get x=20, y=60.

There are deer 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 $x$ and $y$ be the number of deer and peacocks in the zoo respectively. Then,
$x + y = 80$ ...(i) and
$4 x + 2 y = 200$ or $2 x + y = 100$ ...(ii)
Solving (i) and (ii), we get $x = 20$ , $y = 60$ .