Out of four numbers ,the average of first three is 16 and that of the last three is 15. If the last number is 23,the first number is : Answers
A) 22 B) 21 C) 77 D) 99 E) 26
26xplanation:   Let the numbers be a,b,c,d   Given, a + b + c = 48, b + c + d = 45   Now, d = 23   thus, b + c + 23 = 45 ⇒ b + c = 22   Putting the value of b + c in a + b + c = 48   a + 22 = 48 ⇒ a = 26   Answer: 26
<result>E</result>
Out of four numbers ,the average of first three is 16 and that of the last three is 15. If the last number is 23,the first number is :