Question

a sum of rupees 500 is in the form of denominator denominations of rupees 5 and rupees 10 if the total number of nodes is 90 find the number of floors of each type​

Answer 1

Answer:

number of 10 rupees note is 10 and 5 RS note is 80

Step-by-step explanation:

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