сделай схематический рисунок и реши задачу. надо разложить в коробки 20 карандашей, по 6 карандашей в каждую. сколько коробок потребуется? сколько карандашей останется?

Правильно написанно(граматика) И укажите где исправить

Hi!I received your letter! I was glad of hearing from you as well! Thanks for your invitation. But I am compelled to upset you, I can't go with you on concert. The matter is that my parents are going to go  to the cinema and I will be compelled to nurse my little brother. On the next week i wiil be free and we can go on another concert. Thanks for understanding! Well will have fine.