2、280÷3/5 =
I doubt that your score is wrong. Note that you entered 4/ 1, that is, four times three-fifths of the B-stack goods can't be separated. You may have hit five-thirds, so I'm not sure about one or two questions. I will do it after your reply. There are also six questions that I can't do wrong. )
3. Then I'll make 45×3 = 135km 135÷ five sevenths =189km45× 7 = 315km3189 = the answer (myself
4,6/1I'll go to one sixth. 1- (one sixth× 2) = one quarter 20÷ 4 = 55× 6 = 30kg30-20 =10kg.
Answer B: 10kg or more, 30kg.