Average for remaining days: A shopkeeper earns Rs 504 in 12 days. His average for the first 4 days is Rs 40/day. What is his average for the remaining days?

Introduction / Context:
Totals across time blocks with a known partial average let us isolate the remaining block’s total and compute its average.

Given Data / Assumptions:

• Total for 12 days = Rs 504.
• First 4 days average = Rs 40 ⇒ total = Rs 160.
• Remaining days = 8 days.

Concept / Approach:
Remaining total = grand total − first block total. Then divide by days remaining.

Step-by-Step Solution:

Verification / Alternative check:
Add back: 160 + 344 = 504; overall average = 504/12 = 42, consistent with a heavier latter block average of 43 balancing with 40 early on.

Why Other Options Are Wrong:

• Rs 40 or Rs 42 or Rs 45: Do not equal the exact computed 344/8.

Common Pitfalls:
Dividing by the full 12 instead of the remaining 8 or miscomputing the first block total.

Final Answer: