Daily income relation and average: The average income of A, B, and C is Rs 60. B earns Rs 20 more than C, and A earns twice what C earns. Find the daily income of C.

Introduction / Context:
Income relations can be set as variables and solved using the average. Translate each statement into algebra and solve systematically.

Given Data / Assumptions:

• Average of A, B, C = Rs 60, so total Rs 180
• B = C + Rs 20
• A = 2 * C

Concept / Approach:
Let C = x. Then A = 2x and B = x + 20. Substitute into the total to solve for x.

Step-by-Step Solution:

Verification / Alternative check:
A = 80, B = 60, C = 40. Sum = 180, average = 60. Relations are satisfied.

Why Other Options Are Wrong:

• Rs 70, 60, 35, 50: do not satisfy both the total and the linear relations.

Common Pitfalls:
Mistakes arise if B is misread as 20 percent more or if A is misinterpreted. The wording indicates absolute values, not percentages.

Final Answer:
Rs 40