Question

Answer the following

Answer 1

10 ohm & X ohm resistors are in series

so resultant of these two is , 10 + X

& 25 ohm & 75 ohm resistors are in series

sot their resultant will be 25+75=100ohm

now as it is visible , 10+X & 100 ohm resultant resistors are in parallel & give a resultant of 20 ohm so ,

20 = (10 + X)×100/(10+X+100)

20×(110+X) = 100×(10+X)

110 + X = 5(10 + X)

110 + X = 50 + 5X

110-50 = 5X - X

60= 4X

X = 15 OHM

now

total R = 20

& V = 6

so i = v/r = 6/20 = 0.3 ampere