16. Four marks example problems I

Mani and his friend Mohamed went to a hotel for dinner. Mani had \(2\) idlies and \(2\) dosas whereas Mohamed had \(4\) idlies and \(1\) dosa. If the price of each idly and dosa is \(x\) and \(y\) respectively, then find the bill amount in \(x\) and \(y\).

 

Answer:

 

Total bill amount \(=\)