Question

I have `200 with me in the form of `5 notes and `10 notes. The number of
`5 notes is 10 more than that of `10 notes. Find the number of `5 and `10
notes.

Answer 1

Let number of 5 notes be x, So number of 10 notes will be x - 10

Now,

Since, The person has 200, We can write it as:

Number of 5 Notes + Number of 10 Notes = 200

==> 5x + 10(x- 10) = 200

==> 5x + 10x - 100 = 200

==> 15x = 200 + 100

==> 15x = 300

==> x = 20

Hence, There are 20 5's notes and 10 10's notes.