20x7x3=420 mc
420 mc x 1000 l = 420000 litri = 420 to
20x2=40
7x2=14
3x2=6
40x14x6=3360 mc
3360 mc x 1000 l= 3360000 litri=3360 to
problema cu sticlele
cate sticle sunt de 2 litri respectiv 5 litri daca in total sunt 20 de sticle pline cu 64 litri de apa
a+b=20
2a+5b=64
a=20-b
2(20-b)+5b=64
40-2b+5b=64
3b=24
b=24/3=8
a=20-8=12
12 sticle x 2 litri + 8 sticle x 5 litri =64 litri
