Question : The average salary of all the employees in an organization is Rs. 10000. The average salary of 10 technicians is Rs. 8000 and the average salary of the rest is Rs. 14000. The total number of employees in the organization is:
Option 1: 21
Option 2: 18
Option 3: 15
Option 4: 12
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Correct Answer: 15
Solution : Let the total number of employees as E and the number of non-technician employees as N. The total salary paid to all employees is E × 10000. The total salary paid to the technicians is 10 × 8000, and the total salary paid to the non-technicians is N × 14000. Since the total salary paid to all employees is the sum of the total salaries paid to the technicians and non-technicians. ⇒ E × 10000 = 10 × 8000 + N × 14000 Given that the number of non-technician employees is (E – 10). So, E × 10000 = 10 × 8000 + (E – 10) × 14000 ⇒ 4000 × E = 60000 ⇒ E = 15 Hence, the correct answer is 15.
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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
Question : The average of 21 numbers is 60. If each number is increased by 20, then find the number by which the average is increased.
Option 1: 12
Option 4: 20
Question : The average price of 20 pens is Rs. 18. If 12 new pens are added, then the average price rises by Rs. 4. What is the total price of the new pens?
Option 1: Rs. 384
Option 2: Rs. 368
Option 3: Rs. 328
Option 4: Rs. 344
Question : The cost of an article worth Rs. 100 is increased by 10% first and again increased by 10%. The total increase (in Rs.) is:
Option 1: 20
Option 2: 21
Option 3: 110
Option 4: 121
Question : Eleven friends spent Rs. 18 each on a tour and the twelfth friend spent Rs. 11 less than the average expenditure of all twelve of them. What is the total money spent by the twelve friends?
Option 1: Rs. 204
Option 2: Rs. 215
Option 3: Rs. 212
Option 4: Rs. 208
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