Răspuns :
a) 20 l = 20 de sticle de 1 l
b) 20 l = 40 sticle de jumate de litru
b) 20 l = 40 sticle de jumate de litru
sticle de 1 l=20
sticle de jumatate de litru=20x2=40sticle
un litru are doua sticle de jumatate
500ml+500ml=1000=1l
sticle de jumatate de litru=20x2=40sticle
un litru are doua sticle de jumatate
500ml+500ml=1000=1l