how to solve this question?
Attachments:

Answers
Answered by
0
let the number of 10rs. notes be x
and number of 20rs. notes be y
then
From given condition,
10x+20y=800...............,...................1
From second condition,
x+y=50..............................................2
Multiply equation 2 by 10 in order to make coefficient same of x in equation 1 and 2
10(x+y)=10(50)
10x+10y=500......................................3
Subtract equation 3 from 1
(10x+20y)-(10x+10y)=800-(500)
10x+20y-10x-10y=300
20y-10y=300
10y=300

thus the number of 10rs notes is 20 and of 20rs notes is 30
and number of 20rs. notes be y
then
From given condition,
10x+20y=800...............,...................1
From second condition,
x+y=50..............................................2
Multiply equation 2 by 10 in order to make coefficient same of x in equation 1 and 2
10(x+y)=10(50)
10x+10y=500......................................3
Subtract equation 3 from 1
(10x+20y)-(10x+10y)=800-(500)
10x+20y-10x-10y=300
20y-10y=300
10y=300
thus the number of 10rs notes is 20 and of 20rs notes is 30
Similar questions
Hindi,
10 months ago
Social Sciences,
10 months ago
Physics,
10 months ago
Social Sciences,
1 year ago
Hindi,
1 year ago
Chemistry,
1 year ago