14. A lady has 25 paise coins and 50 paise coins. If in all she has 80 coins totaling Rs.21, the difference between the number of 25 paise coins and 50 paise coins is:-
Anita has only 20 paise & 25 paise coins in her purse. She has 50 coins in all totaling to Rs.11.25. The linear equation representing the situations is