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Rozwiazanie:
I - x+15
II - x
III - 0,5x
x+15+0,5x = 2x
1,5x+15 = 2x
2x-1,5x = 15
0,5x = 15 |:0,5
x = 30
I - 30+15 = 45
II - 30
III - 30:2 = 15
razem: 45+30+15 = 75+15 = 90
Odpowiedz: Ala ma 90 książek.