5m.......7p.............134 kg | *3
3m........8p.............126 kg |*5
15m......21p...................402 kg
15m......40p...................630 kg
-------------------------------------
/ 40-21=19p.......630-402=228 kg
o lada de pere p= 228/19=12 kg
3m.........8*12=96 kg.......126 kg
3m=126-96 kg
3m= 30 kg
m=10 kg (lada de mere)