Average test 5-Solved questions with detailed explanations for SSC, IBPS, SBI PO, RRB, RBI, CSE, CGL, CHSL, CDA, CSE, UPSC

6)

The sum of five numbers is 290. The average of the first two numbers is 48.5 and the average of last two number is 53.5. what is the third number?

[Indians Oveseas Bank (PO), 2009]

A)
72
B)
84
C)
96
D)
108
E)
None of these

Discussion

7)

The average of 5 numbers is 306.4. The average of the first two numbers is 431 and the average of the last two numbers is 214.5. What is the third number?

[Bank of Maharashtra(PO), 2008]

A)
108
B)
52
C)
321
D)
Cannot be determined
E)
None of the above

Discussion

8)

Kamlesh bought 65 books for ₹ 1050 from one shop and 50 books for ₹ 1020 from another. What is the average price, he paid per book?

[Bank of Maharashtra(PO), 2008]

A)
₹ 36.40
B)
₹ 18.20
C)
₹ 24
D)
₹ 18
E)
None of these

Answer: Option D

Explanation

Given,

Total number of books = 65+50 =115

Average paid price

$= \frac{1050 + 1020}{115} = \frac{2070}{115}$

= 18

Hence, Option D is correct.

For more Short tricks and formulae click

Average

Discussion

9)

The average of the ages of Sumit, Krishna and Rishabh is 43 yr and the average of the ages of Sumit, Rishabh and Rohit is 49 yr. If Rohit is 54 yr old, then what is Krishna's age?

[SBI (PO), 2008]

A)
45 yr
B)
24 yr
C)
36 yr
D)
Cannot be determined
E)
None of these

Discussion

10)

The average age of seven boys sitting in a row facing North is 26 yr. If the average age of first three boys is 19 yr and the average age of last three boys iS 32 yr, then What is the age of the boy who is sitting in middle of the row ?

[Bank of Punjab and Sindh Bank (AAO), 2008]

A)
28 yr
B)
29 yr
C)
24 yr
D)
31 yr
E)
None of these

Discussion

Average Test-5 (Calculating weighted average)

Answer: Option E

Answer: Option E

Answer: Option D

Answer: Option C

Answer: Option B