Answers

2016-02-07T17:46:25+05:30
R +d =10  (1)
d+r = 20   (2)
C+D =24  (3) 
add (1) (2) (3)
2r+2c+2d =54
2(c+r+d) =54
c+R+d =54/2 = 27
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2016-02-07T18:16:56+05:30
C+R = 10
D+R = 20
D+C = 24
adding (I),(II) & (III) we get ,
 2D+2R+2C = 54
2(R+D+C) = 54
 R+D+C = 27 .
i hope it helps.......
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