4 целых 5/7 : х = 1 целая 4/21
2 целых 1/5 + х = 2 целых 3/8 + 1 целая 5/12

В решебе посмотри там будет

Where did mr and mrs gray live? did mr or mrs gray work in a bank? who was fond of music and art? the grays had a son, didn't they? what was his name? what didn't peter like ? where did mr and mrs gray want to spend the summer? they found а nice small house far from mr gray's office, didn't they? how long were peter and his mother going to stay there? what did the bоу do when they arrived at the house? did hе see а nice kitchen with а white fridge, two cupboards, а cooker and а sink? there wasn't electricity in the house, was there? what did peter see in the corner? was there a  fireplace in the sitting room? did  peter find а bathroom? was peter was glad  that there was no hot and cold running water in the house, wasn't he?

Врешебе посмотри там будет

1)76*4=304
2)23*4=92
3)304+92=398(км растояние )

(у+50)*2=300
у+50=300:2
у+50=150
у=150-50
у=100
(100+50)*2=150*2=300
Ответ у=300.