Grandmother 2848

Old mom keeps chickens and hares. He has five times more hens than hares. Boris calculated that all animals have a total of 210 feet. How many hares and how many hens does my grandmother have?

Correct answer:

s =  75
z =  15

Step-by-step explanation:


s = 5z
2s+4z = 210

s = 5·z
2·s+4·z = 210

s-5z = 0
2s+4z = 210

Pivot: Row 1 ↔ Row 2
2s+4z = 210
s-5z = 0

Row 2 - 1/2 · Row 1 → Row 2
2s+4z = 210
-7z = -105


z = -105/-7 = 15
s = 210-4z/2 = 210-4 · 15/2 = 75

s = 75
z = 15

Our linear equations calculator calculates it.



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