in my farm, i keep chickens and goats, the total head count for both is 19 and the total number of their legs is 60. How many chickens and goats are there in farm?

19

1 head= 2 or 4 legs.

Johnny’s mother had three children. The first child was named April. The second child was named May. What was the third child’s name?

Simple...

let chicken = x
and goats = y

Then just solve the equation..

x + y = 19 (based on heads)
2x + 4y = 60 (based on legs)

Thus
x=19-y

therefore
2(19-y)+4y=60
38-2y+4y=60
2y=22
y=11

Thus x=8

Therefore: chicken are 8 with 16 legs
goats are 11 with 44 legs.

Total 19 heads and 60 legs.

**unless you are including the '5th leg' of the billy goats

Ditto