Bunuel wrote:

If a set of numbers consists of 1/4 and 1/6, what number can be added to the set to make the average (arithmetic mean) also equal to 1/4?

A. 1/6

B. 1/5

C. 1/4

D. 1/3

E. 1/2

The average of 3 numbers must be \(\frac{1}{4}\)

Since one of the 3 numbers is equal to the mean,

the average of the other two numbers should also be 1/4

If the third number is x, (1/6 + x)/2 = 1/4 => 1/6 + x = 1/2 => x = 1/2 - 1/6 = 2/6 =

1/3(Option D)
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