Question

There are 1120 Rs in a bag of Rs.20 and Rs.5 denomination. A total number of notes is 80. Find how many notes of Rs.20 are there?
Solve this question by allocation methods.

Answer 1

x+y=80

20x+5y=1120

15x+(5*80)=1120

15x=720

x=720/15

x=48

there are 48 note of 20 rs.