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2:7
Jumlah:27
Misalkan
Jethro 2x : Ronald =7x
Jethro+Ronald=Jumlah kelereng
2x+7x=27
9x=27
x=3
Jumlah kelereng Ronald = 7x=7(3)=21
Kelereng Ronald =21 butir
(9 didapat dari 7+2)
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