nomor 3/5 saja pakai cara ya

maaf klo jawabannya salah ^_^

No 5.
A = 7/(7+5+9)*147
A = 7/21 x 147
A = 7 x 7
A = 49

B = 5/21 x 147
B = 5 x 7
B = 35

C = 9/21 x 147
C = 9 x 7
C = 63