Discussion

Explanation:

p = $\frac{q}{2}$ ⇒ $\frac{p}{q}=\frac{1}{2}$

q = $\frac{r}{3}$ ⇒ $\frac{q}{r}=\frac{1}{3}=\frac{2}{6}$

So, p : q : r = 1 : 2 : 6

So, r = $\frac{6}{1+2+3}$ × 180 = 120.

Hence, option (d).

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