If two positive non-zero real variables x and y are such that (x+y) is proportional to x/y, then x+y:

The number of different coins that a person has are in the ratio 5:3:13. Of these, 25% are 1 rupee coins. The percentage of 50 paise coins is

For positive non-zero real variables p and q, if log(p2+q2) = log p + log q + 2 log 3, then the value of (p4 + q4) / (p2q2) is