Let there be n one-rupee coins. Therefore there are 3n 50-paise coins. Hence total money is Rs. n (on account of 1-rupee coins) + Rs.(1/2)x(3n) [On account of 50-paise coins]= 35
Or (2n+3n)/2 = 35 ==> 5n = 70 ==> n = 14.
Hence there are 14 1-rupee coins and 42 50-paise coins.