# Important Formulas

Q1. Find the average of first 20 natural numbers ?
(a) 6
(b) 7.5
(c) 10.5
(d) 12

Q2. Total sale of a shop is 7770 Rs in a week. Find the daily average sale of the store ?
(a) 111
(b) 1110
(c) 770
(d) 999

Q3. The average monthly salry of 10 emplpyees is 3600 Rs. If the salary of the manager is added then the average salary is increased by 200 Rs. What is the monthly salary of the manager ?
(a) 3700 Rs
(b) 4200 Rs
(c) 5800 Rs
(d) 6200 Rs

Q4. The average of three odd number is 45. What is the value of the highest number ?
(a) 33.3
(b) 42.3
(c) 45
(d) 47.5

Q5. A batsman in his 10th innings, makes a score of 72 runs and thereby increases his average score by 3 runs. What will be the average after 10th innings ?
(a) 45
(b) 46
(c) 47
(d) 48

Q6. A man covers half of his journey at 7 km/hr and the remaining half at 2 km/hr. His average speed is
(a) 2(1/2) km/hr
(b) 3(1/9) km/hr
(c) 4.5 km/hr
(d) 9 km/hr

Q7. The average age of 11 palyers of a cricket team is decreased by 2 months when two of them aged 17 years and 20 years are replaced by two new players. The average age of the new players is
(a) 17y 7 months
(b) 19y 3 months
(c) 21y 9 months
(d) 23y 11 months

Q8. A man covers half of his journey at 6 km/h and the remaining half at 4 km/h. His average speed is
(a) 3.9 km./h
(b) 4.3 km/h
(c) 4.8 km/h
(d) 5.2 km/h

Q9. There were 35 students in a hostel. If the number of students be increased by 7, the expenditure on food increases by Rs. 42 per day while the average expenditure of students is reduced by Rs. 1. What was the initial expenditure on food per day ?
(a) Rs. 375
(b) Rs. 390
(c) Rs. 420
(d) Rs. 460

Q10. The average monthly salary of employees, consisting of officers and workers of an organisation is Rs. 3000. The average salary of an officer is Rs. 10000 while that of a worker is Rs. 2000 per month. If there are 400 employees in the organisation, the number of officers is
(a) 50
(b) 60
(c) 65
(d) 75

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