Question : The average of 4 numbers is 45. The average of the first two numbers is thrice the average of the other two numbers. What is the sum of the first two numbers?
Option 1: 122
Option 2: 105
Option 3: 125
Option 4: 135
Correct Answer: 135
Solution :
The average of 4 numbers is 45.
Total = 4 × 45 = 180
Let the average of the first two numbers be $x$ and the average of the other two numbers $3x$.
According to the question,
$2x+(3x)×2=180$
$⇒8x=180$
$\therefore x = 22.5$
So, the sum of the first two numbers = $6×22.5=135$
Hence, the correct answer is 135.
Related Questions
Know More about
Staff Selection Commission Multi Tasking ...
Answer Key | Cutoff | Selection Process | Preparation Tips | Eligibility | Application | Exam Pattern
Get Updates Brochure
Your Staff Selection Commission Multi Tasking Staff Exam brochure has been successfully mailed to your registered email id “”.
