If p + q + r = 180 and p = q/2 and q = r/3, find r.
Explanation:
p = q2 ⇒ pq=12
q = r3 ⇒ qr=13=26
So, p : q : r = 1 : 2 : 6
So, r = 61+2+3 × 180 = 120.
Hence, 120.
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