tolong bantu ini kak.. no 24 dan 25

24. CF/CB = EF/AB
CF/(CF+4)=5/7
7CF = 5CF + 20
7 CF - 5 CF = 20
2 CF = 20
CF = 10
Jawab : B
25. SR/PQ = SO/OQ
4/12 = SO/(20-SO)---->SO+OQ=QS
SO+OQ=20
OQ=20-SO
1/3 = SO/(20-SO)
3SO = 20-SO
3SO+SO = 20
4 SO = 20
SO = 5
Jadi panjang SO = 5 cm
Jawab : C