Question

o cantitate de mere trebuie pusa in lazi.daca puenm in fiecare lada cite 5kg de mere ,ramin 12 kg. daca punem in fiecare lada cite 6 kg de mere, ramin doua lazi goale si o lada cu 5 kilograme. cite lazi si cite kilograme de mere sunt?

Answer 1

x=cantitatea de mere si y=numarul de lazi
y*5+12=x =>5y=x-12 => y=(x-12)/5
y*6-2*6-1=x => [(x-12)/5]*6-13=x
(6x-72)/5=13+x ,inmultesti toata ecuatia cu 5 si rezulta :
6x-72=65+5x
6x-5x=65+72=137
x=137kg => y=(137-12)/5=25