1. Bianca intr-o zi cumpara un kg de mere, a doua zi cumpara de cinci ori mai multe kg de mere. Cate kg Bianca cumpara Bianca a doua zi daca in cele doua zile a cumparat in total 80 kg?
2. a) |------|
b) |------|------|------|------|
c) |------| ..... 12 segmente
Total : 1700l
1+4+12 = 17 segmente
1700l: 17 = 100l(a)
100l × 4 = 400l(b)
400l× 3 = 1200l(c)
Verificare = 100+400+1200 = 1700l