Question

In trei zile un magazin a vandut 371paini. Cate paini a vandut in fiecare zi daca a doua zi a vandut triplul numarului de paini vandute in prima zi iar a treia zi cu 56 mai mult decat in prima zi

Answer 1

notam cu a-I zi, cu b - a II zi si cu c-III zi
a+b+c=371
b=3a
c=a+56 inlocuim in a+b=c=371
a+3a+a+56=371
5a=371-56
5a=315
a=315/5
a=63 deci in I zi a vandut 63 paini
b=3a=3x63=189
deci a II zi a vandut 189 paini
c=a+56=63+56=119

63+189+119=371

Answer 2

a+b+c=371
b=ax3
c=a+56
a+ax3+a+56=371
ax5=371-56
ax5=315
a=315:5
a=63( paini in  prima zi)
63x3=189( paini in a doua zi)
63+56=119( paini in a treia zi)