Răspuns:
( am facut 20 patratele ca se poate imparti la 4 si la 5)
|_____|_____|_____|_____| t= total
|_____| a= 1/4 *t prima zi
|_____|_____|_____| R= 3/4 *t
|____|____|____|____|____|
|____| b= 1/5*t a doua zi
c= 220
a=[tex]\frac{1}{4} *t= \frac{t}{4}[/tex] b= [tex]\frac{1}{5} *t= \frac{t}{5}[/tex]
t- a-b= 220
t- [tex]\frac{t}{4}[/tex] - [tex]\frac{t}{5}[/tex]= 220 aducem la acelasi numitor
20t-5t- 4t= 220 *20
20t- 9t= 4400 11t= 4400 => t= 4400:11= 400 pagini total
a= 400:4= 100 pagini prima zi
b= 400: 5= 80 pagini a doua zi
verif : 100+80+220= 180+220= 400 pag
