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(5+2) / (5-2) x 12
7/3 x 12 = 28
(5-2 = 3)
Andi=perbandingannya 2
Irfan= perbandingannya 5
Jadi:
Andi = 2/3 x 12= 8 kelereng
Irfan= 5/3 x 12 = 20 kelereng
Jumlahnya.. 20 +8= 28 kelereng (c)