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f=fahri
k=kafa
perbandingan a:f=5:3
perbandingan a:k=2:3
jumlah kelereng f dan k= 42 butir
kelereng a =(5×2):(3×2):(3×3)
=10:6:9(a:f:k)
=6+9=15
=10/15×42
=28 butir
42:3=14
14x2=28