Consider the circuit shown below. Find the current flowing through 20 Ω resistor:

Correct option is A

​$$\text{Total resistance} = 4 + \left( \frac{1}{10} + \frac{1}{20} \right)^{-1} \\= 4 + 6.667 \\= 10.667 \\I = \frac{V}{R} \\I = 1.87494 \text{ A} \\\text{Current through resistor } 20 \Omega_2 = I \times \frac{R_1}{R_1 + R_2} \\= 1.87494 \times \frac{10}{30} \\= 0.625 \text{ A}$$​​