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13:5x315=819
504-819=315
Ibu : Tante : Nenek = 8 : 13 : 17
Ibu + Tante = 315
= 315 ÷ ( 8 +13 )
= 315 ÷ 21
= 15
Jumlah Piring Ibu = 15 × 8
= 120 Piring
Jumlah Piring Tante = 15 × 13
= 195 Piring
Jumlah Piring Nenek = 15 × 17
= 255 Piring
Selisih Piring Nenek & ( Tante + Ibu ) = ( 195 + 120 ) - 255
= 315 - 255
= 60 Piring
Jumlah Piring Nenek , Tante & Ibu = 120 + 195 + 255
= 570 Piring