Мастер изготавливате а деталей в час,а его ученик --в2 раза меньше.сколько деталей они изготовят вместе,если мастер будет работать 6 часов, а его ученик --4 часа.( решить по )

a*6=6a деталей изготовил мастер за 6 часов

а/2*4=2а изготовил ученик за 4 часа

6а+2а=8а

8а деталей

Music, like the other fine arts, is what feeds the soul and touches the body, moving it.  anyone who has grown up with a musically talented parent knows the tremendous part that music plays in one's memory.  and, anyone who has "been acquainted with the night" as robert frost put it, knows and can relate to the blues.  music can fit our moods, as well.  i will always remember riding along with a friend years ago.  this friend loved hard rock, but he had  johnny cash's "sunday morning coming down" playing as i got into the car.  "what is this? " i asked. "you don't ever listen to country western; in fact, you loathe it! " "yeah, it's the strangest thing:   after breaking up with all seems to make sense now.  anyway, i think i feel like johnny did in this song," he replied. yes, sometimes we are in harmony with what music says and it talks to us, and  pulls at our hearts in most unusual ways, nurturing, comforting, commiserating, exhilirating, soothing, strengthening us against the dark.  what would life be like without it?   terribly cold and silent, indeed.