Question

A sum of rs 500 is in the form of denominations of rs 5 and rs 10.if the total number of Number of notes is 90, find the number of notes of each type

Answer 1

5/- = 80 notes
10/- = 10 notes

Answer 2

Let 5rs note be x
10rs note be y
According to 1st condition,
5x +10y=500_(1)
According to 2nd condition,
X+y=90
Therefore,x=90-y _(2)
By eq(1)&(2)
5(90-y)+10y=500
450-5y+10y=500
5y=500-450
y=50/5
Y=10
Therefore, number of 10rs notes are 10
X+y=90
x+10=90
X=80
Therefore, number of 5rs notes are 80