Вопрос школьника по предмету Алгебра
сколько кг золота нужно добавить к сплаву массой 4 кг и содержащему 15% золота, чтобы повысить содержание в нем золота до 60% от общей массы?
Ответ учителя по предмету Алгебра
Ответ:
2 кг 400г нужно добавить
Объяснение:
))
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Laura (live) in a big city. If she (live) in the country, she (have) a dog. Laura (share) a flat with three other girls. But if it (be) possible, she (live) on her own. If she (live) in the country, she (buy) a little cottage, and she (grow) her own flowers and vegetables. In town, she (travel) by underground and (go) shopping in big department stores, but she (not/like) this at all. If she (be) in the country, she (ride) her bike, and she (buy) things in the little village shop. She (love) walking and often (go) for a walk in town, but the streets are noisy. In the country, she (walk) across the fields with her dog.
1. Look at this! They ____ a new magazine.
a) are reading b) read c) is reading d) have read
2. A lot of tourists______ to Buckingham Palace every year.
a) come b) are coming c) came d) is coming
3. There ________ many places to visit in London.
a) is b) will be c) are) d)has
4. She _______ her grandmother last week.
a) visit b) has visited c) visited d) have visited
5. They ____ tennis next week.
a) play b) played c) will play d) plays
6. Have you ever _____ to any museums in England?
a) been b) be c) was d) were
7. The boys _____ a video in their room now.
a) have watched b) is watching c) are watching d) watches