65438 of 3+0-65438 of 4+0 = 02 1.
heavy
420-380 = 40g
Alcohol is very heavy.
40/121= 480g
Use 65,438+0 alcohol, and the rest of the alcohol will be heavy.
480× ( 1- 1) = 360 g。
Bottle weight
420-360 = 60 grams