Question

There are deer and peacocks in zoo. By counting heads they are 80. The number of their legs is
200. How many pecocks are there?
1) 40
2) 60
3) 20
4) 50​

Answer 1

Answer:

let no of deer be x and peacock be y

Step-by-step explanation:

X + Y is equals to 80 eq1

4 x + 2 Y is equals to 200 (AS DEER HAS 4 LEGS AND PEACOCK HAS 2) eq2

from eq 1

x = 80-y eq 3

putting value of x from equation 3 in equation 2

320-4y+2y= 200

-2y=-120

y=60

x = 80-y

x=80-60

x=20

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Answer 2

x+y=80

x=80-y

x+2y=100

80-y+2y=100

y=20

no of pecocks =80-20=60

option 2)......