[CSAT Paper -2] 2. Aptitude – Rare coin collection

In a rare coin collection, there is one gold coin for every three non-gold coins. 10 more gold coins are added to the collection and the ratio of gold coins to non-gold coins would be 1: 2. Based on the information; the total number of corns in the collection now becomes
(a) 90
(b) 80
(c) 60
(d) 50

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