To number pages of the thick book, the printer used 4201 digits. How many pages has this book?

Correct answer:

x =  517

Step-by-step explanation:

c1=9 c2=2 90=180 c3=3 900=2700  c4=4201(c1+c2+c3)=4201(9+180+2700)=1312  x=9+90+90+c4/4=9+90+90+1312/4=517

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