1.
4 * 16 = 64 lei masinute
64 + 35 = 99 lei a primit Andrei
2.
2 + 4 + 6 + 8 = 20 probleme mai mult in cele 4 zile
120 - 20 = 100 probleme de rezolvat in 5 zile
100 : 5 = 20 in prima zi
20 + 2 = 22 in a 2-a zi
24 + 2 = 26 in a 3-a zi
26 + 2 = 28 a 4-a zi
28 + 2 = 30 in a 5-a zi
20 + 22 + 24 + 26 + 28 = 120 total