Arithmetic word problem (currency denominations): Find the total number of notes when counts per denomination are equal. A man has ₹480 in one-rupee, five-rupee, and ten-rupee notes. The number of notes of each denomination is the same. Calculate the total number of notes he has. Choose the correct value.

Given data

• Total money = ₹480.
• Denominations: ₹1, ₹5, ₹10.
• Equal number of notes of each denomination ⇒ let that number be x.

Concept/Approach Total value = x·1 + x·5 + x·10 = 16x ⇒ solve 16x = 480.

Step-by-step calculation 16x = 480 ⇒ x = 480 ÷ 16 = 30. Total notes = 3x = 3 × 30 = 90.

Common pitfalls Adding denominations but forgetting to multiply each by the same count x.