Răspuns:
a-creion
b-pix
c-stilou
10a + 7b + 2c=120
b=2a
c=25b=25x2a=50a
ne ducem in suma mare
10a+ 7x2a+ 2x50a=120
10a+14a+100a
124a=120
a=120/124=60/62=30/31=0.96 lei
b=2x0.96=1.32 lei
c=25x1.32=34 lei
20x 0.96+ 20x1.32 +20x 34=19.2 +26.4+680=725.6 lei
Daca esti in 5-8 inseamna ca e bine.
Daca esti in 1-4 am gresit eu undeva sau e problema gresita.
