Q.
A. 45
B. 60
C. 75
D. 90
E. None of the above
Correct choice: D
Explanation:
Let number of notes of each denomination be x.
Then x + 5x + 10x = 480
⇒ 16x = 480
∴ x = 30.
Hence, total number of notes = 3x = 90.