# math

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Of the books in a library, 1/3 came from Robbie's collection and 15 came from Marta's. Of the rest, 15 were Elena's 1/5 were Winfield's, and 5 were purchased from the bookstore. How many book are there in the library?

• math -

0.333x + 15 + 15 + 0.2x + 5 = x

0.533x + 35 = x

35 = x - 0.533x

35 = 0.467x

75 = x

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