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If a + 8b = 14 and 5 a - 2b = 16, then what is the mean of a and b? (A) 15 (B) 7.5 (C) 5 (D) 2.5 |
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Answer» (D) 2.5 Given, a + 8b = 14 5a – 2b = 16 ∴ 6a + 6b = 30 ⇒ a + b = 5 ∴ mean a+b/2 = 2.5 |
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