Question

A sum of 500 is in the form of denominations of Rs5 and Rs 10
If the total no.of notes is 90 find the no.of notes of each type?

Answer 1

Answer:

no.of Rs.5 notes=80

no.of Rs.10 notes =10

Step-by-step explanation:

Let no.of Rs.5 notes=x

no.of Rs.10 notes=y

A.T.Q.

5x+10y=500....(1)

x+y=90.....(2)

Apply (2)×5-(1)

we get

(5x+5y)-(5x+10y)=450-500

=5y-10y=-50

-5y=-50

y=10

on putting value of y in (2) we get

x=80