Join Testzone
ABOUT US
CONTACT US
Blog
support@smartkeeda.com
Quantitative Aptitude
Reasoning Aptitude
General English
Knowledge Bank
Current Affairs
Law Exams
Average Quiz 9
Average Quiz 8
Average Quiz 7
Average Quiz 6
Average Quiz 5
Average Quiz 2
Average Quiz 1
Home
»
Quantitative Aptitude
»
Arithmetic
»
Average Level 1
» CDSE » Average Quiz 2
all
SBI Clerk Pre
SBIClerk
IBPS Clerk Pre
IBPSClerk
IBPS PO Pre
IBPSPO
SBI PO Pre
SBIPO
IBPS RRB
SSC 10+2
CGLTier 1
CGL Tier 2
CDSE
CLAT
MAT
NIFT
IBPS CL Mains
IBPS SO Pre
Syndicate Bank PO
Canara Bank PO
Railways
RBI Grade B
RRB Scale I Pre
CCC
IBPS SO Law
IBPS SO HR
IBPO SO AFO
IBPS SO IT
UGC NET
IBPS SO Mktg
RJS
LIC AAO
NABARD
EPFO SSA Pre
LIC Assistant
Join Testzone, Smartkeeda’s Test Series Platform for:
Hi
Directions: Study the following questions carefully and answer the questions given below:
Important for :
CDSE
CGL Tier 2
CGLTier 1
CLAT
SSC 10+2
1
The average of a non-zero number and its square is 7 times the number. The number is:
A
13
B
17
C
29
D
28
» Explain it
Correct Option:
A
Let the number be x. then,
x + x
^{2 }
= 7x
2
x
^{2}
+ x = 14x, x
^{2}
– 13 x = 0, x [ x – 13] = 0, x = 0, 13.
So the number is 13 .
1
A
B
C
D
» Explain it
सही विकल्प :
A
A
2
The average of 5 consecutive numbers is 30. The largest of these numbers is:
A
20
B
22
C
32
D
40
» Explain it
Correct Option:
C
Let the number be x, (x+1), (x+2), (x+3) & (x+4).
then,
(
x + (x+1) + (x+2) + (x+3) + (x+4)
)
= 30.
5
5x + 10 = 150, x = 140/5, x = 28.
So, the largest number is: x + 4 then,
put the value of x in the largest number: x + 4 = 28 + 4
⇒
32.
2
A
B
C
D
» Explain it
सही विकल्प :
C
C
3
The average of seven consecutive odd numbers is 36. What is the difference between the highest and lowest numbers ?
A
2
B
5
C
12
D
Can't be determined
» Explain it
Correct Option:
C
Let the smallest odd number be x
so acc. to the que. the consecutive num are
x, x + 2, x + 4, x + 6, x + 8, x + 10, x +12.
So the diffrence is x + 12 - x = 12.
Hence, option C is correct.
3
A
B
C
D
» Explain it
सही विकल्प :
C
C
4
The sum of four consecutive odd numbers is 30 more than the average of these numbers. What is the first of these numbers?
A
7
B
14
C
17
D
Data inadequate
» Explain it
Correct Option:
A
Let the numbers be
x
,
x
+ 2 ,
x
+ 4 & x + 6.
then, (x + x + 2 + x + 4 + x + 6) –
x + x + 2 + x + 4 + x + 6
=
30
4
⇒
4x + 12
–
(
4x + 12
)
= 30
4
Or, ( 4x + 12 – x – 3) = 30, So, 3x = 21, x = 7
So first number x = 7.
Hence, option A is correct.
4
A
B
C
D
» Explain it
सही विकल्प :
A
A
5
The mean of 1
^{3}
, 2
^{3}
, 3
^{3}
, 4
^{3}
, 5
^{3}
is :
A
30
B
35
C
45
D
70
» Explain it
Correct Option:
C
To solve this question, we can apply a short trick approach
1
^{3}
+ 2
^{3}
+ 3
^{3}
+........n
^{3}
=
n
^{2}
(n + 1)
^{2}
4
By the short trick approach, we get
1
^{3 }
+ 2
^{3 }
+ 3
^{3 }
+......+ 5
^{3}
=
5
^{2}
(5 + 1)
^{2}
=
5
^{2}
× 6
^{2}
4
4
4
⇒
(
25 x 36
)
= (25 x 9 ) ⇒ 225.
4
So,
Required average =
(
225
)
= 45.
5
Hence, option C is correct.
5
A
B
C
D
» Explain it
सही विकल्प :
C
C
Previous Excercise
Next Excercise