Răspuns:
Cartea are 48 de pagini (care sunt numerotate pe fiecare pagina )
a) 1+2+3+4+5+6+7+8+9+10=55 (primele 5 file)
b) 48÷2=24 file ( foi )
c) 1,2,3,4,5,6,7,8,9,10 =11 cifre
11,12,13,14,15,16,17,18,19,20 =20 cifre
21,22,23,24,25,26,27,28,29,30 =20cifre
31,32,33,34,35,36,37,38,39,40 =20cifre
41,42,43,44,45,46,47,48 = 16 cifre
Total 11+20+20+20+16= 87 cifre
d) 3, 13,23,30,31,32,33,34,35,36,37,38,39,43
De 15 ori
e) 11,22,33,44 - 4 pagini
