Question

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Answer 1

Answer:

10+10+(1/30+1/10)

=20.13

Answer 2

Explanation:

Resistors R1,R5,R6 are in series so use formula for series combination

R=R4+R5+R6

R=30kohms

now this equivalent is in parallel combination with the resistor R3 so use parallel combination

1/R=1/R+1/R3

1/R=1/30+1/10

1/R=4/30

R=30/4

now this equivalent is in series combination with r2 and r2

R=10+10+30/4

R=110/4 kohms