410,860+m*20=489.000 g

Question

410,860+m*20=489.000 g

Answer 1

410.860 +m*20=489.000

m*20 = 489.000-410.860

m*20= 78.140

m= 78.140:20 = 3.907

Answer 2

m * 20=  78.140

m = 78.140 / 20 = 3.907

Ответ:3.907