Question

Madalina cumpara 4 prajituri si 6 sucuri platind 42 lei ,iar Beatrice cumpara 4 prajituri si 8 sucuri platind 52 de lei.Cati lei costa o prajitura?Dar un suc?

Answer 1

2 sucuri=52-42=10lei
un suc=5lei
4 prajituri+30=42
4prajituri=12
o prajitura=3lei

Answer 2

4 p+6s =42
4p+8s =52    -
----------------
/     2s =10
s =5

4p+6*5 =42
4p+30 =42
4p =42-10 =12
p =12:4 =3
v  ;   4*3+6*5 =12+30 =42