Total equivalent resistance of this circuit
Well, you have the good method but, it seems you have some difficulties to find the equivalent resistor of 2 resistors in parallel. 

$$ 1 / Req = 1/R1 + 1/R2 $$
$$ 1 / Req = (R2 + R1) / R2R1 $$
$$Req = R2R1/(R1 + R2)$$

If R1 = R2 = 1 ohm, Req is 0,5 ohm. I let you finish your exercice ;)







simulate this circuit &ndash; Schematic created using CircuitLab

Isn't it clearer?