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...................... 4%
xg 0% ......................... 80-4=76
20/x = 4/76
4x = 20*76
4x = 1520
x = 380g
20g + 380g = 400g
x - 20g r-ru
x=16gCH3COOH
4g CH3COOH -100g r-ru
16g - y
y=400g r-ru