Ishaan's wallet has only ₹50 and ₹10 notes, worth ₹2,800 in all. He has twice as many ₹10 notes as ₹50 notes. How many notes does he have altogether?

Explanation

1. 01

   Let there be $f$ notes of ₹50, so $2f$ notes of ₹10.

2. 02

   Value: $50f + 10(2f) = 70f = 2800$, so $f = 40$.

3. 03

   Total notes $= 40 + 80 = 120$.