|_____|_____|_____|
1 sapt |_____| 5|
2 sapt |___|___|___|
|___|3|
|__|__|__|
3 sapt |__|1|
|_17_|
17+1=18
18:2=9
9+1= 10 timbre in a 3 a saptamana
9x3=27
27+3=30
30:2=15
15+3=18 timbre a 2 a sapt
15x3=45
45+5=50
50:2=25
25+5=30 in prima sapt
10+18+30+17=28+47=75 timbre