Notam cu "x" nr de pagini in total
Prima zi:
[tex] \frac{1}{4} x[/tex]
I-a mai ramas:
[tex]x - \frac{x}{4} = \frac{4x - x}{4} = \frac{3x}{4} [/tex]
A doua zi:
[tex] \frac{1}{2} \times \frac{3x}{4} = \frac{3x}{8} [/tex]
x-(prima zi+ a doua zi) =45
[tex]x - (\frac{x}{4} + \frac{3x}{8}) = 45 \\ \frac{8x}{8} - \frac{2x + 3x}{8} = 45 \\ \frac{3x}{8} = 45 \\ x = \frac{45 \times 8}{3} \\ x = 15 \times 8 \\ x = 120 [/tex]
