Răspuns :
[tex] \frac{1}{4} \times 80 = \frac{1 \times 80}{4} = \frac{80}{4} = 20 \: (ieri)[/tex]
[tex]80 - 20 = 60 \: (rest)[/tex]
[tex] \frac{1}{5} \times 60 = \frac{1 \times 60}{5} = \frac{60}{5} = 12 \: (azi)[/tex]
[tex]80 - (20 + 12) =80 - 32 = 48 \: (pagini \: ramase)[/tex]
[tex]80 - 20 = 60 \: (rest)[/tex]
[tex] \frac{1}{5} \times 60 = \frac{1 \times 60}{5} = \frac{60}{5} = 12 \: (azi)[/tex]
[tex]80 - (20 + 12) =80 - 32 = 48 \: (pagini \: ramase)[/tex]