1.

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

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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