In a rare coin collection there is one gold coin for every three non gold coins 10 more gold coins a...........

Quantitative Aptitiude (CLAT) Ratio, Proportion

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

Explanation:

Find the Initial ratio = Gold (G):Non-Gold(N) = 1:3 .....(i) After adding 10 gold coins, the ratio becomes (10+G):N = 1:2 ..... (ii) On solving (I) & (ii), you get, G=20 and N=60. Therefore, now the total number of coins in the collection = (10+G)+N= 10+20+60=90.