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# Mathematics - Important Questions and Answer of All Competitive Exams (TNPSC, UPSC, SSC, RRB and Bank Exam)

1. The Average of first 9 prime numbers is:
a. 9
b. 11
c. 11 1/9
d. 12

2. The average of first 8 multiples of 5 is
a. 51
b. 52
c. 22.5
d. 40

3. Out of three numbers, the first is twice the second and half of the third. if the average of these numbers is 56, the smallest of these numbers is?
a. 36
b. 24
c. 35
d. 27

4. A man covers half of his journey at 6 km/hr and the remaining half at 3 km/hr. His average speed is
a. 2 km/hr
b. 5 km/hr
c. 3 km/hr
d. 4 km/hr

5. The average age of a man and his son is 35 years. The ratio of their age is 5:2. What is son's age?
a. 6 years
b. 12 years
c. 20 years
d. 25 years

6. The average of 25 results is 18; that of first 12 is 14 and that of the last 12 is 17. The 13th result is:
a. 75
b. 78
c. 60
d. 76

7. The average of 24 boys and their teacher is 15 years. When the teacher's age excluded, the average age decreases by 1 year. The age of the teacher is
a. 39 years
b. 40 years
c. 81 years
d. None of the above

8. If the total monthly income of 16 persons is Rs.80800 and the income of one of them is 120% of the average income, then his income is:
a. Rs.6000
b. Rs.6150
c. Rs.6060
d. Rs.6245

9. The average age A, B and C is 25 years and their ages are in the ratio 3:5:7. What is the age of A?
a. 15 years
b. 16 years
c. 17 years
d. 18 years

10. A Man and a boy together worked for 5 days and were paid Rs.800 as its labour. If the man works thrice as much as a boy in the same time, what are the daily wages of the boy?
a. Rs.55/-
b. Rs.50/-
c. Rs.40/-
d. Rs.74