NABTEB Mathematics 2022 Objective — Question 45
Question 45 of 50 from the National Business and Technical Examinations Board (NABTEB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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The mean of two numbers x and y is 4. Find the mean of the four numbers x, 2x, y and 2y.
- A. 2
- B. 4
- C. 6Correct
- D. 8
Explanation
Since mean of x and y is 4, x+y=8. Mean of x,2x,y,2y = (x+2x+y+2y)/4 = 3(x+y)/4 = 3(8)/4 = 6.
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