plisss bantuin bingung

1 gros = 12 lusin
1 lusin = 12 buah

Maka:
3,5 gros = 12 lusin x 3,5 = 42 lusin

Total piring nenek = 42 lusin + 5 lusin = 47 lusin

Ibu = 5/12 bagian.
Maka, piring ibu sebanyak = 5/12 x 47 lusin = 235/12 lusin = 235 buah piring

diketahui = piring awal = 3.5 gros + 5 lusin
diberikan ke ibu = 5/12
ditanya = jumlah pirng yg diberikan ke ibu?

Jawab

1 gros = 12 lusin
3.5 gros = 3.5x12
= 42 lusin

jumlah piring smuanya = 42 lusin + 5 lusin = 47 lusin

yg diterima ibu = 47.5/12 = 19,5 lusin

jadi, piring yg diterima ibu sebanyak 19,5 lusin