312g
1 tiers = 1/3 et 1/3 x 312 = 104g
2 tiers = 2/3 et 312 x 2/3 = 208 g
3 quarts = 3/4 et 312x 3/4 = 234 g
1/2 = 1/2 et 312 x 1/2 = ..... g
