Răspuns :
5 pizza..............................60
9 pizza...............................x
Folosind regula de trei simple
5/x=9/60
x=9x60/5
x=540/5
x=108$
9 pizza...............................x
Folosind regula de trei simple
5/x=9/60
x=9x60/5
x=540/5
x=108$