There are 175 pages in the book.
Step-by-step explanation:
Given,
Pages read by Elena = 55 pages
Let,
x be the number of pages of book.
Pages read by Andre = [tex]\frac{1}{5}\ of\ total\ pages = \frac{1}{5}x[/tex]
As Elena has read 20 more pages than Andre, therefore,
[tex]\frac{1}{5}x+20=55\\\\\frac{1}{5}x=55-20\\\\\frac{1}{5}x=35[/tex]
Multiplying both sides by 5
[tex]5*\frac{1}{5}x=35*5\\\\x=175[/tex]
There are 175 pages in the book.
Keywords: fraction, variable
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