First of all, we can see in combination, two resistors of 10 ohms are in parallel, we have to solve this by applying special case formula, then all the resistors becomes in series except 5ohm resistor, so now we have to solve these all the series combination by just summation of all the resistors, then becomes new resistance will appear which is parallel to resistor with battery, so now again it is a special case, therefore further you will do so...
