Сумма и произведение четырёх целых чисел равны 8. Назовите большее число.

решите пж 10к+2*(7к-2)=5*(4к+3)+3к

Найти ошибки в предложениях
1-He can speak the french.
2-He don't know German.
3-They live in the China.
4-She didn't knew that man.
5-I am not understanding the teacher.
6-The children aren't sleepinq,aren't they ?
7-He can plays computer games.
8-We don't know his.
9-She send him e-mails every day.
10-Did Robin wrote a letter to his friends?
11-If Misha will not help Robin , Robin will not go back to his time.
12-There are much salt in the soup.
13- Everybody like to swim in the sea.
14-You had to help her,didn't you ?
15-His grandfather was an old brave man.
16-They'll go to Black Sea next year.
17- The longest river is Nile , isn't it ?
18-I was seeinq him at 6 o'clock yesterday.
19-There is no life on the Moon .
20-Misha had met Robin before he met Rob
21- Have you ever seen Tsar Bell?
22-Is a torch cheaper then a penknife ?
23-Who is the best football player in your class?
24- We watched TV when they came
25- What you were doing yesterday at 5 o'clock ?
26-They had been in London last year.
27-What have you already did?
28-We never have played this game.
Помогите пожалуйста((( умоляю (((

Два мотоциклиста выехали одновременно навстречу друг другу из пунктов А и В и встретились через 20 минут. Прибыв в пункты В и А соответственно, мотоциклисты сразу же повернули назад и встретились вновь. Через сколько минут после первой встречи это произошло?