SOLUTION: Ann was 1/4 of the way through her book. 20 pages later she was 1/3 of the way through her book. When she was 3/4 of the way through the book, how many pages will she have to read

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Question 829716: Ann was 1/4 of the way through her book. 20 pages later she was 1/3 of the way through her book. When she was 3/4 of the way through the book, how many pages will she have to read to finish the book?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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x = y/4
x + 20 = y/3
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put the system of linear equations into standard form:
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4x = y
3x + 60 = y
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4x - y = 0
3x - y = -60
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copy and paste the above linear system in standard form into this matrix-method solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 60 pages
y = total pages in the book = 240
when she's 3/4 of the way through, her remaining pages = (1/4)y = 60 pages
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