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a:b = 5:2
maka :
5x - 2x = 24
3x = 24
x = 8
maka a= 5x=5.8 = 40
dan b = 2x=2.8 = 16
c= 1/7 .(a+b) = 1/7 . (40+16) = 1/7 . 56 = 8 :)