Question

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

Answer 1

Step-by-step explanation:

There r about 500 rupees of 5 and 10 notes

The total number of notes =90

Let x=5

y=10

the sum of 5 and 10 rs=rs.5x+10y=500

The total number of notes =x+y=90 eq 1

now 5x+10y=500÷5

1x+2y=100eq 2

by eq 1 and 2

1x+2y=100

1x+1y=90 by eliminating we get 1x and1x will be canceled and y=10

now by eq 2 x+y=90

x+10=90

x=90_10=80

so x=80

the number of x notes be 80 and number of y notes