Asum of rs 500 is in the form of denominators of rs5 & rs 10..if the total no. of notes is 90 ,find the no. of notes of each do it by process will be mark as best

Let rs.5 denominations be x , then rs 10 denominations will be 90-x

then total amount 5x + 10(90-x) which is rs.500

 5x + 10(90-x) = 500

900 - 5x = 500
400 = 5x
therefore x = 80
          therefore no. of rs.5 is 80
no. of rs.10 is 90-x = 90-80 = 10

Set square i think so

Do you have answer choices?