tolong nomor19 pakai jalan

Dik:
= 8 lusin buku tulis
= 48 buah pulpen = 48 ÷ 12 = 4 lusin pulpen
= 5/12 gros pensil = 5/12 × 12 = 5 lusin
= 4 lusin penggaris

Dit:
= 8 lusin + 48 buah + 5/12 gros + 4 lusin
= 8 lusin + 4 lusin + 5 lusin + 4 lusin
= 21 lusin
Jawabannya A