1) a=masa; b=scaun
9a=9b+378 / :9 => a=b+42
a+b=142
b+42+b=142 => 2b=100 => b=50
a=142-50=92
2) a=stofa; b=matase
10a=10b+180 / :2 => a=b+18
2a+2b=276 / :2 => a+b=138
b+18+b=138 => 2b=120 => b=60
a=60+18=78
3) smaralde = 840/10 = 84
rubine = 84/4 = 21
diamante = 21/7 = 3
turcoaze = 840-85-21-3 = 731