11. Find the number of coins

A box contains \(₹\)​688​ in the denomination of \(₹1\), \(₹2\) and \(₹5\) coins. The coins are present in the ratio of \(​8​ : ​5​ : ​5​\). Find how many \(₹​2​\)  coins are in the bag?

 

Ans: ​