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= 5/9 x 27
= 5 x 3
= 15 butir
sisa kelereng robi
= 27 - 15
= 12 butir
g(b) = 2b + 1/2
1 = 2b + 1/2
1 - 1/2 = 2b
1/2 = 2b
b = 1/4