12. Find the number of coins

A box contains \(₹\)​374​ in the denomination of \(₹1\), \(₹2\) and \(₹5\) coins. The coins are present in the ratio of \(​7​ : ​5​ : ​1​\). Find how many \(₹​1​\)  coins are in the bag?

 

Ans: ​