Question

slove in paper step by step equation

Answer 1

total resistance is 10 ohm

all are in parallel so

1/R eq = 1/20 + 1/30 + 1/60

R eq = 10

in 2nd question you have not given the value of voltage
if v is the total voltage then
current is

V / 10

Answer 2

hello friend..!!

the three resistors are parallel 

therefore,

 1 / R = 1 / R1 + 1 / R2 + 1 / R3

1 / R = 1 / 20 + 1/ 30 + 1 / 60

1 / R = 3+ 2 + 1 / 60

R = 60 / 6

R = 10 ohm

⇒ the total resistance is 10 ohm 

⇒ the total current is ,

V = I R 

I = V / R 

so to find total current potential is required. 

I = V / 10. ampere 

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hope it helps...!!