найти полную поверхность и объем прямоугольного параллелепипеда,если его измерения равны 15,16,20

Change the following sentences into the passive voice: 1.He didnt clean the room yesterday. 2.I shall send a letter to my friend next monday. 3.Who wrote this book? 4.We were discussing the text when he entered. 5.They have already chosen the topic of the discussion. 6. When did you receive this information. 7.He must feed his pet every day. 8. My grandfather built a house two years ago. 9. What pets do people keep in their houses? 10.I shall give her all the paper tomorrow. 11. We always help him when he is in trouble. 12.If you dont take me to the station, I shall be late. 13.WIll you return the book to Mary tomorrow. 14.We dont usually write articles about music for the school newspaper. 15.How many friends will you invite to the party? 16.My mother didnt help me to write the essay in English. 17.Do you often help your mother about the house. помогите пожалуиста!!!!

Два тракториста вспахали поле за 6 часов.Если поле будет пахать один тракторист. то он его вспахает за 10 часов.За сколько часов вспахает поле второй тракторист???

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