Question

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

Answer 1

5x + 10y = 50
x + y = 90

Answer is attached ...

Answer 2

let the number of RS 5 note be x

& RS 10 note be y

according to the condition

5x+10y=500 ----eqn 1

x+2y=100

x+y=90

x=90-y

putting the value of y in eqn 1

(90-y)+2y=100

y=10

x=80

the no. of RS5 note=10 &no. of RS 10 note is80