Difficulty: Easy
Correct Answer: 2520
Explanation:
Introduction / Context:
This question checks algebraic handling of perimeter and difference constraints for rectangles, followed by area calculation.
Given Data / Assumptions:
Concept / Approach:
From P = 2(L + B) we get L + B. With a system L + B and L - B, solve for L and B, then compute area = L * B.
Step-by-Step Solution:
Verification / Alternative check:
Check difference: 63 - 40 = 23. Check perimeter: 2*(63+40) = 2*103 = 206. Consistent.
Why Other Options Are Wrong:
2420, 2320, 2620, 2300 do not match L*B given the exact L and B derived from both equations.
Common Pitfalls:
Using P instead of P/2 for L+B or mixing up which is larger (length vs breadth) leads to wrong numbers.
Final Answer:
2520
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