Mr McDonald has some ducks and goats in his farm. If he counted a total of 94 legs and 30 heads, find the number of ducks and the number of goats in his farm.

Answer 1

number of ducks ---- d
number of goats ----- g

d + g = 30 , they have 1 head each
2d + 4g = 94
or
d + 2g = 47
subtract the two equations:
g = 17

the d + 17 = 30 ----> d = 13

state the conclusion