1. v + a = 30
a + 20 = v
a + 20 + a = 30
2a + 20 = 30
2a = 30-20
2a = 10
a = 10:2
a = 5 (albe)
20+ 5 = 25 (verzi)
2. a + a + 1 + a + 2 = 1002
3a + 3 = 1002
3a = 1002-3
3a = 999
a = 999:3
a = 333 ( primul nr)
333 + 1 = 334 ( al doilea nr)
333 + 2 = 335 (al treilea nr)
