n 48
|---------------|---------------| 154+48=202
n 57
|---------------|----------------------| 154+57=211
n 63
|---------------|----------------------------| 154+63=217
Total =630
Deci 630 este 3*n+48+57+63=630
3*n=630-48-57-63 => 3*n=630-168 => 3*n=462 => n=154