Question

A sum of rupees 500 is in the form of notes of denomination of rupees 5 and 10 if the total number of notes is 90 find the number of notes of each type

Answer 1

Let the number of Rs 5 notes be x
Hence the number of Rs 10 notes be (90 − x)
Total sum of money = Rs 500
∴ 5x + 10 (90 − x) = 500
5x + 900 − 10x = 500
 − 5x = 500 − 900 = −400
∴ x = 80
Hence there are 80 notes of Rs 5 and 10 notes of Rs 10.