3. RS = 24, RK = 2 KS, RK, KS — ?

Так как RK = 2KS, обозначим KS = x. Тогда RK = 2x.

1. RK + KS = RS;
2. 2x + x = 24;
3. 3x = 24, значит x = 8;
4. KS = 8, RK = 2 · 8 = 16.

Ответ: RK = 16, KS = 8.