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HAYVANLARIN KAÇI İNEK, KAÇI TAVUK Empty HAYVANLARIN KAÇI İNEK, KAÇI TAVUK

Mesaj  Admin C.tesi Ekim 23, 2010 2:03 am

A farmer has 30 animals consisting of chickens and cows. The animals have 74 legs in total. Find out the number of chickens and cows the farmer has.




























Answer 23 Chickens and 7 Cows

Let the number of chicken be X and number of cows be Y
X+Y = 30
Chickens have 2 and cows have 4 legs.
Hence,
Number of legs chickens have = 2X
Number of legs cows have = 4Y
2X + 4Y = 74.
Putting X = 30 - Y (from first equation)
2(30 - Y) + 4y = 74
60 - 2Y + 4Y = 74
2Y = 14
Y = 7


X = 30 - 7
X = 23


The farmer has 7 cows and 23 chickens.




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