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27 = Xp × 30
Xp = 0,9
Xp = np ÷ (np + nt)
0,9 = (27 ÷ 18) ÷ ((27 ÷ 18) + nt)
1,35 + 0,9 nt = 1,5
nt = (1,5 - 1,35) ÷ 0,9
= 0,167
gr = nt × Mr
= 0,167 × 60
= 10