SOLUTION: 4r+2c= 84 if r+c=30

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Question 63785: 4r+2c= 84 if r+c=30
Answer by tanimachatterjee(60) About Me  (Show Source):
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4r+2c= 84 if r+c=30
taking common 2(2r+c) = 84
2r +c = 42

r +c =30
substructing we get r =12
then c =30-12 = 18