here here :

The task: in the studio was 7 m. blue fabric, 11 m. yellow, 5 m. red and 10 m. white. There is three meters of fabric on the dress. How many dresses do portraits sew?
All children divided the numbers by 3, dropped the remains, put together the whole ones. But Lo wasn't like that, Lo put together the remains and counted how many different colour dresses would be. So many white, so many red, so many colored. I was lowered in this assessment.

One non-professional has made an incorrect task (missed the word "one-color"), and another non-professional teaches children to match the system. Who does not want to be a obedient worker after school, think with your mind and do not be afraid of low marks!