Answer:
272 pages
Explanation:
First, think of 100% of "x" as x*1.00
Thus, 80% of "x" is x*0.8
So, a 20% decrease of "x" would be x*(1.00-0.2)=x*0.8
We know x is 340 pages, so a 20% decrease would be 340*0.8=272 pages.
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