🧠 Question:
There are chickens and goats on a farm. The total number of heads is 50, and the total number of legs is 140. How many more chickens than goats are there?
📘 Solution:
Let chickens = x
Let goats = y
From heads:
x + y = 50
From legs:
2x + 4y = 140
Divide second equation by 2:
x + 2y = 70
Subtract first equation:
(x + 2y) - (x + y) = 70 - 50
y = 20
x = 30
Difference = 30 - 20 = 10
