19. Five mark exercise problems IX

There are \(12\) pieces of five, ten and twenty rupee currencies whose total value is \(₹105\). But when the first \(2\) sorts are interchanged in their numbers, their value will be increased by \(₹20\). Find the number of currencies in each sort.

 

 

The number of \(₹5\) currencies is .

 

The number of \(₹10\) currencies is .

 

The number of \(₹20\) currencies is .