Subject: General Aptitude · Chapter: Average · Exam: 2009 · Marks: · Difficulty:
What is the fourth number in the descending order?
(a)91
(b)95
(c)97
(d)99
(e)None of these
Answer
Answer (as printed): D
Explanation
The average of five consecutive odd numbers is 95. Let the numbers be $x, x+2, x+4, x+6$ and $x+8$. Then, $\frac{x+(x+2)+(x+4)+(x+6)+(x+8)}{5}=95$ or $5x+20=475$ or $5x=455$ or $x=91$. So, the numbers are 91, 93, 95, 97 and 99. Clearly, the fourth number in the descending order is 93.
Explanation as extracted from the printed page; notation may be imperfect.