Question

this is question answer​

Answer 1

Explanation:

LET RESISTANCE OF 10 OHM BE R1

SIMMILLARY

X R2

25 R3

75 R4

NOW

R1 AND R2 IS IN SERIES &

R3 AND R4 ARE ALSO IN SERIES

AND BOTH COMBINATIONS ARE IN PARALLEL

SO

1/20 = 1/(10+X) +1/100

1/20-1/100= 1/(10+X)

5-1/100=1/(10+X)

4/100=1/(10+X)

1/25 = 1/(10+X)

CROSS MULTIPLY

10+X=25

X=15