Question

a sum of rupees 500 is in the former of 5 rupee and 10 rupee notes. If the total number if notes be 75, find the number of notes of each type?

Answer 1

let the number of 5 rupee notes be x and 10 rupees notes be y then
5x+10y=500 and
x+y=75
solve this simultaneous equation
you will get x=50 and y =25

Answer 2

Let the no. of Rs. 5 notes be x.

Total no. of notes is 75.

So no. of Rs. 10 notes = (75- x)

Total amount in the form of

Rs. 5= Rs. 5* x= Rs. 5x

Rs. 10= Rs.10* (75-x)= Rs. 750- 10x

Given

Total money= Rs. 500

=>5x + 750- 10x= 500

=>-5x+750=500

=>-5x=500-750=-250

=>5x=250

=>x=250/5= 50

So total no. of

Rs. 5 notes= x = 50

And Rs. 10 notes = 75- X=75-50=25