Subject: General Aptitude · Chapter: Average · Exam: · Marks: · Difficulty:
There are six numbers 30, 72, 53, 68, x and 87, out of which x is unknown. The average of the numbers is 60. What is the value of x? (Bank Recruitment, 2010)
Answer
Answer (as printed):
Explanation
Average of given numbers $=\left(\frac{30+72+53+68+x+87}{6}\right)=\left(\frac{310+x}{6}\right)$. $$\therefore \quad \frac{310+x}{6}=60 \Rightarrow 310+x=360 \Rightarrow x=50 .$$ Hence, $x=50$.
Explanation as extracted from the printed page; notation may be imperfect.