Question

A sum of ₹500 is in the form of denominations of ₹5 and ₹10. If the total number of
notes is 90 find the number of notes of each denomination.
(Hint: let the number of 5 rupee notes be 'x', then number of 10 rupee notes=90-x)​

Answer 1

Step-by-step explanation:

5x+10(90-x)=500

5x+900-10x=500

10x-5x=900-500

5x=400

x=400/5=80

and (90-x)=(90-80)=10

Answer 2

Step-by-step explanation:

5x+10(90-x)=500

5x+900+10x=500

10x-5x=900-500

5x=400