Який об'єм води необхідно добавити до 60 г розчину з масово часткою KOH 40%, щоб виготовити розчин із масовою часткою лугу 15%?

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My best  friend always knows howto cheer me up when Im sad.

My brother and I often fall out over small unimportant things.

My friend has never let down me yet.

Out History teacher had to split up because  we were giggling in the classroom.

I don t like those girls. They  think that they are the most beautiful in the class and show off their pretty clothes all the time.

My friend and I always stick together in difficult situations.

Tom was homesick at first, but  he cheered up after he met John