Question

Nitish is as old as three time Rohit is after 3 years he will be twice as old as Rohit find their present age
And Mohan changed rupees 2 into 5 paise 20 paise and 50 paise coins if the number of 5 paise coin was double the number of 20 paise coin and the 50 paise coins were 1/5 the 20 paise coins how many coins of each denominations did he get

Answer 1

which chapter and which class?