1 1/2 gros-3/4 lusin+ 1/2 lusin=....lusin

1 gross = 144 buah = 12 lisin, maka
11/2×12=66 lusin
MAKA 66-3/4+1/2=(264-3+2)/4
=263/4
= 65 3/4 lusin
maaf yah kalo salah

144+72=216=18lusin
3/4lusin=9lusin
1/2lusin=1/2lusin
18+9+1/2
27,5