Question
Swapnil has rs590 in currency notes with denominations of rs 50,rs20,rs10. The ratio of the number of rs.50 notes and rs.20 notes is 3 :5. If he has total of 25 notes how many notes of each denomination does he have
Answers
Reiny
let the number of 50 notes be 3x
let the number of 20 notes be 5x , notice they are in 3:5 ratio
number of 10 notes = 25 - 3x - 5x or 25 - 8x
value of notes equation:
50(3x) + 20(5x) + 10(25-8x) = 590
150x + 100x + 250 - 80x = 590
170x = 340
x = 2
sub back into my definitions
let the number of 20 notes be 5x , notice they are in 3:5 ratio
number of 10 notes = 25 - 3x - 5x or 25 - 8x
value of notes equation:
50(3x) + 20(5x) + 10(25-8x) = 590
150x + 100x + 250 - 80x = 590
170x = 340
x = 2
sub back into my definitions