Ladislav was reward and went to conference in Amsterdam. Conferense fee was € 3484.

Calculate how many books Ladislav could buy at the price of 48 and 52 euros if he don't want fill whole home library and he can buy only 70 books?

Correct result:

books by € 48:  39
books by € 52:  31

#### Solution:

x+y=70
48•x+52•y=3484

x+y = 70
48x+52y = 3484

x = 39
y = 31

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