If average of x and 1/x is 5/2, x is MCQ with Answer and Explanation

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If average of x and 1/x is 5/2, x is

A. 5

B. 1

C. 2 or 0.5

D. 4

Answer: Option C

Solution (By JKSSB Mock Tests)

(x +1/x)/2 =2.5. x +1/x=5. x^2 -5x +1=0. x= [5±sqrt21]/2 but options for simple 2: (2+0.5)/2=1.25 no. Use valid.

This question belongs to: Maths Average

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Question #1

Average of 70,105,140 is

A. 110

B. 105

C. 102

D. 100

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Correct Answer: Option B

Explanation:
315/3=105.

This question belongs to: Maths Average

Question #2

The average of 1020,1360,1700 is

A. 1360

B. 1370

C. 1355

D. 1350

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Correct Answer: Option A

Explanation:
4080/3=1360.

This question belongs to: Maths Average

Question #3

The average of 4 numbers is 15. If one number is 0, what is the average of the other three?

A. 18

B. 15

C. 20

D. 22.5

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Correct Answer: Option C

Explanation:
Sum=4×15=60. Other sum=60-0=60. Avg=60/3=20.

This question belongs to: Maths Average

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