(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Average

(Study Material) RRB NTPC (Tier -2) Exam (Numerical Aptitude) - Average

1. The average age of a husband, his wife and daughter 2 yr ago was 24 yr and that of his wife and daughter 4 yr ago was 18 yr. What is the husband’s present age ?

(a) 32 yr
(b) 30 yr
(c) 34 yr
(d) 36 yr

2. Five years ago the average age of four men is 48 yr. Now, a new man joins and the average age increases by 2 yr. What is the age of the new man?

(a) 36 yr
(b) 42 yr
(c) 41 yr
(d) 38 yr

3. The mean yearly salary of an employee of a company was ` 20000. The mean yearly salaries of male and female employees were ` 20800 and ` 16800 respectively. Find the ratio of males to females employed by the company

(a) 3 : 2
(b) 4 : 1
(c) 2 : 1
(d) 5 : 3

4. Average of two numbers is 14.5 and square root of their product is 10. What are the numbers ?

(a) 16 and 9
(b) 25 and 4
(c) 4 and 16
(d) 25 and 9

5. The average age of a group of four men whose ages are in the ratio 2 : 3 : 4 : 5 is 42 yr, what is the age of the eldest person in this group ?

(a) 60 yr
(b) 48 yr
(c) 36 yr
(d) 24 yr

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