Question

When two resistances are connected in series their effective resistance is 18 ohm.When they are connected in parallel the effective resistance is 4 ohm..Find two resistances.

Answer 1

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Answer 2

if two resistance are in series then
let x , y two resistance
x+y=18

and for parallel
x+y=4xy
buy putting value
18/4=xy=4.5

so
x=9/2y

so
9/2y+y=18
9+2y²=36y

solve equation and find ans.
hope it helps to you!