John Has A Farm With Cows And Chickens. There Are 1284 Legs All In All. John Has 142 Chickens. How Many Cows Are There?, Show The:, Equation, Solution

John has a farm with cows and chickens. There are 1284 legs all in all. John has 142 chickens. How many cows are there?

Show the:
Equation
Solution
Final Answer

 

Let:

cows = a

chickens =

Equation: (number of legs) 2a + 4b = 1284

Solution:

2a + 4b = 1284; a = 142

2(142) + 4b = 1284

284 + 4b = 1284

4b = 1284 - 284

4b = 1000

b = 250

There are 250 cows.