4,5 lusin - 1 1/2 kodi + 5/6 gross=.....gross (A) 204 (B) 144 (C) 7,5) (D) 7,2

1 gross = 144 buah
1 lusin = 12 buah
1 kodi = 20 buah

= 4,5 lusin - 1,5 kodi + 5/6 gross
= (4,5 x 12) - (1,5 x 20) + (5/6 x 144)
= 54 - 30 + 120
= 144 buah
= 1 gross

4,5 lusin = 4,5 × 12 = 54 buah
= 54/144 = 3/8 gross

1 1/2 kodi = 1,5 × 20 = 30 buah
= 30/144 = 5/24 gross

4,5 lusin - 1 1/2 kodi + 5/6 gross
= 3/8 gross - 5/24 gross + 5/6 gross
= 9/24 gross - 5/24 gross + 20/24 gross
= 24/24 gross
= 1 gross