Difficulty: Medium
Correct Answer: 48°
Explanation:
Introduction / Context:
Complementary angles sum to 90°, and supplementary angles sum to 180°. The statement links linear expressions of the same unknown through these definitions.
Given Data / Assumptions:
Concept / Approach:
Translate to an equation in x and solve. Keep complements and supplements distinct.
Step-by-Step Solution:
Verification / Alternative check:
Complement = 42°, supplement = 132°. LHS = 6*42 = 252; RHS = 2*132 − 12 = 264 − 12 = 252 ✓.
Why Other Options Are Wrong:
They fail the given linear relation when checked.
Common Pitfalls:
Mixing up 90 − x and 180 − x; arithmetic slips while simplifying; sign mistakes with the “12° less”.
Final Answer:
48°
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