Question : The average salary of all staff of a school is Rs. 10,000. The average salary of 20 teaching staff is Rs 12,000 and that of non-teaching staff is Rs. 5,000, the number of non-teaching staff will be
Option 1: 7
Option 2: 8
Option 3: 10
Option 4: 12
Correct Answer: 8
Solution :
Average salary of all staff = Rs. 10,000
Average salary of 20 teaching staff = Rs. 12,000
Average salary of non-teaching staff = Rs. 5,000
Let the number of non-teaching staff be $x$.
Total salary of non-teaching staff = Rs. $,5000x$
Total salary of teaching staff = Rs. $12000 \times 20$ = Rs. 2,40,000
Total salary of all staff = Rs. $10000 \times (x + 20)$ = Rs. $(10000x + 200000)$
$⇒ 5000x + 240000 = 10000x + 200000$
$⇒ 40000 = 5000x$
$⇒ x = 8$
∴ The total non-teaching staff is 8.
Hence, the correct answer is 8.
Related Questions
Know More about
Staff Selection Commission Multi Tasking ...
Application | Cutoff | Selection Process | Preparation Tips | Eligibility | Exam Pattern | Admit Card
Get Updates Brochure
Your Staff Selection Commission Multi Tasking Staff Exam brochure has been successfully mailed to your registered email id “”.
