Seeta Devi has Rs 9 in fifty- paise and twenty five-paise coins. She has twice as may twenty- five paise coins as she has fifty- paise coins. How many coins of each kind does she have?
Let the number of coins of fifty paise are 
Number of coins of twenty five paise are 
Amount due to fifty paise coins = 
Amount due to twenty five paise coins = 
According to the question total amount = Rs 9
Therefore the number of coins of fifty paise are 
Number of coins of twenty five paise are 
10