Question

70 coins of 10 paise are mixed in a purse. If the total value of the money in the purse is Rs 19 , find the number of 50 paise coins

Answer 1

no of 10 paise coins =7o 
then value of 70 10 ps coins=70*10=700=rs7
no of 50 ps coins =total coins -10 ps coins
=19-7=12

Answer 2

Value of 10 paise coins in a purse is Rs. 7
Hence value of remaining coins is Rs.!2
Hence there are 24 coins of 50 paise