Let total no. of 10 RUPEENOTES be 2x then 20rupee note be 3X so total no.of notes are 2x + 3x = 5x 5x = 1600 => x = 1600/5 => x = 320 no.of 10 rupee notes= 2*320= 640 so 64notes no.of 20 rupee notes = 3*320=960 so 48 notes hence total notes are 64 + 48 = 112