Question

a sum of rs.800 is in the form of denomination s of rs.10 and rs.20. if the total number of notes is rs.50, find the number of notes of each type.

Answer 1

Let the NUMBER of notes of rupees 10 be X
Let the NUMBER of notes of rupees 20 be Y

According to the given condition :
The total amount is 800

Hence
$10x + 20y = 800$
According to the second Condition
The total number of notes is 50

Hence
$x + y = 50$
Multiplying equation 2 by 10 and solving for Y
we get

$y = 30$
Therefore
$x = 10$
Thus there are
30 Notes of RS.20
and
10 Notes of RS.10