X had 60 coins, out of which 1/2 were Indian coins and 1/6 were US coins. How many other coins did he have?

Correct option is D

Given,

$$\text{Indian coins} = 60 \times \frac{1}{2} = 30$$

$$\text{US coins} = 60 \times \frac{1}{6} = 10$$

$$\text{Other coins} = 60 - (30 + 10) = 20$$​​​