1.jumatatea cantitatii
20:2=10L
2. nr de sticle folosite de un sfert de litru
10×4=40sticle ( 1L are 4 sferturi 250g)
3.cantitea ramasa injumatatia
10:2=5L
4)nr. de sticle de jumatate de litru
5×2=10 sticle
5. nr. sticle de 1L
5×1=5 sticle
6.nr total de sticle
40+20+5=65 sticle