Out of four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 20, than first number is :
Solution(By Apex Team)
Let a, b, c, d are four number ∵ Average of first three number a, b, c = 16 Total of (a + b + c) = 16 × 3 = 48…..(i) Again ∴ Average of last 3 numbers b, c, d = 15 ⇒ Total of (b + c + d) = 15 × 3 = 45…..(ii) ⇒ Subtracting equation (i) – (ii), we get ⇒ (a + b + c) – (b + c + d) = 48 – 45 ⇒ a – d = 3 ⇒ a = – 20 = 3 [Given d = 20] ⇒ a = 23 ⇒ Therefore, first numbera = 23
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