se aplica cel mai rapid regula dreptunghiului:
c1%= 10%-----------> 30-15= 15 parti masa sol. 10%
c.f.= 15%
c2%= 30%---------> 15-10= 5 parti masa sol. 30%
-------------------------------------------
total = 15+5 = 20 parti masa sol. 15%
20 parti sol. 15% ........ 15 parti sol. 10% ....... 5 parti sol. 30%
20kg sol.finala .............. ms1 ........................... ms2
=> ms1 = 15 kg
=> ms2 = 5 kg
