Question

A sum of 500rupess is in the form of denomination of Rs5 nd Rs10. If the total number of notes is 90, find the number of notes of each type

Answer 1

Answer:

let number of 5 rupees note be x

let number of 10 rupees note be y

total number of notes=90

Atq

x+y=90 -1st

5x+10y=500-2nd

reduce 2nd equation

x+y=90

x+2y=100

=change the sign and solve by elimination

-y=-10

y=10

x+y=90

x=90-10

x=80

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