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85% ------------- 748
100% ----------- x
x = 100% * 748 / 85% = 880
Odp. Księgozbiór Karola liczy 880 tomów.
x - ilosc ksiazek
15% - ksiazki przyrodnicze
czyli 100% - 15% = 85% inne ksiazki
748 = 85%
x = 100%
x/748 = 100/85
x = 100/85 * 748
x = 20/17 * 748 = 20 * 44 = 880
Ksiegozbior Karola liczy 880 ksiazek