The mean of two numbers x and y is 4. Find the mean of fo...
The mean of two numbers x and y is 4. Find the mean of four numbers x, 2x, y and 2y
2
4
6
8
Correct answer is C
Since the mean of the two numbers x and y is:
x+y2 = 4
x+y =2 * 4
x+y = 8
then we get:
x+2x+y+2y4
=(3x+3y4)
= 3(x+y4) → 3(84)
= 3 * 2
= 6
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