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1. If (4x-7)<(2x+13), then which of the following must be true?
- A. x>9
- B. x>9
- C. x>9
- D. x>9
Answer: Option D
Explanation:
(4x7)<(2x + 13)
⇒4x7 + 7<2x + 13 + 7
⇒4x - 2x<2x + 20 – 2x
⇒2x < 20
∴x 10
⇒4x7 + 7<2x + 13 + 7
⇒4x - 2x<2x + 20 – 2x
⇒2x < 20
∴x 10
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