Question

Cu 47 litri de apa sunt umplute 19 sticle de 2 l si de 3l. Cate sticle sunt de fiecare fel

Answer 1

avem 47 litri si trebuie sa umplem 19 sticle.
47:5l=9,4 ...presupunem ca avem sticle in mod egal:
9*2l=18l
9*3l=27l
In total 18 sticle=45 litri, mai avem nevoie de 2 litri si o sticla,
Raspuns:
10 sticle *2 litri= 20 litri
9 sticle*3litri=27 litri
Proba:
20l+27L=47 litri adevarat
10 sticle+9 sticle=19 sticle adevarat

Answer 2

a=2l, b=3l
a+b=19=>a=19-b
2a+3b=47

2(19-b)+3b=47
38-2b+3b=47
b=47-38
b=9 sticle la 3 litri
a=19-9=10 sticle la 2 litri