Try this beautiful problem from Algebra about Page number counting
Hui is an avid reader. She bought a copy of the best seller Math is Beautiful. On the first day, Hui read \(\frac{1}{5}\) of the pages plus more, and on the second day she read \(\frac{1}{4}\) of the remaining pages plus 15 pages. On the third day she read \(\frac{1}{3}\) of the remaining pages plus 18 pages. She then realized that there were only 62 pages left to read, which she read the next day. How many pages are in this book?
Algebra
Arithmetic
multiplication
Answer:$240$
AMC-8, 2010 problem 21
Challenges and Thrills in Pre College Mathematics
assume that the number of all pages be \(x\)
Can you now finish the problem ..........
count day by day
can you finish the problem........
Let x be the number of pages in the book
First day ,Hui Read \(\frac{x}{5} + 12\) pages
After first day Remaining pages=\(\{x-(\frac{x}{5}+12)\}\)=\(\frac{4x}{5} -12\)
Second day ,Hui Read \(\frac{1}{4} (\frac{4x}{5} -12) +15=\frac{x}{5} +12\)
After Second day Remaining pages= \((\frac{4x}{5} -12) -(\frac{x}{5} +12)\)=\(\frac{4x}{5} -\frac{x}{5}-24\)=\(\frac{3x}{5} -24\)
Third day,Hui read \(\frac {1}{3} (\frac{3x}{5} -24) +18\) =\((\frac{x}{5} -8+18)\)=\(\frac{x}{5} +10\)
After Third day Remaining pages = \((\frac{3x}{5} -24) -(\frac{x}{5} +10)\) =\(\frac{2x}{5} - 34\)
Now by the condition, \(\frac{2x}{5} - 34 = 62\)
\(\Rightarrow 2x-170=310\)
\(\Rightarrow 2x=480\)
\(\Rightarrow x=240\)
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