tolong dibantu ya...

20 ohm
1/ Rp= 1/10 + 1/15 +1/30
= 3/30+ 2/30 + 1/30
= 6/30
Rp= 30/6
=5
jadi Rs= 15+ 5
= 20

gitu mungkin

[tex] ket : \\ rp = rangkaian \: paralel \\ rt = rangkaian \: total \\ \\ \frac{1}{rp} = \frac{1}{10} + \frac{1}{15} + \frac{1}{30} \\ \: \: \: \: \: \: \: = \frac{3 + 2 + 1}{30} \\ \: \: \: \: \: \: \: = \frac{6}{30} \\ rp \: = \frac{30}{6} \: \: \: \: \: (dibalik) \\ \: \: \: \: \: \: \: = 5 \: ohm \\ \\ rt = 15 \: ohm \: + \: 5 \: ohm \\ \: \: \: \: \: = 20 \: ohm[/tex]

maaf kaloo salahh
smoga membntuu:D