the box would weight 50 grams since 3 bags of flour contained 300 grams each would add up 900 grams now subtract 900 from 950 like this 950-900=50 and that's your answer. hope this helped :)
the empty box weights 50 grams. as the total weight is 950, and you have 3 bags that weight 300. 3x300=900 950-900=50 50 is the total weight that is left fi you were to take the 3 bags out of the box
