SOLUTION: The ratio of chickens, lambs and cows is 1:2:4 respectively. If the total number of animals is 21 how many lambs are there?

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Question 1017981: The ratio of chickens, lambs and cows is 1:2:4 respectively.
If the total number of animals is 21 how many lambs are there?



Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
If x:y:z = a:b:c

Then

, , 


Let the number of chickens be x
Let the number of lambs be y
Let the number of cows be z
a:b:c = 1:2:4
x+y+z = 21
a+b+c = 1+2+4 = 7

, , 

Multiply each through by 21

, , 

Edwin
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