Question

What fraction must be subtracted from the sum of 1/4 and 1/6 to have an average of 1/12 of all the three fractions?

Answer 1

Answer:

sum = 1/4 + 1/6 = 5/12

Average of the three numbers :  1/4,  1/6,  x   be   1/12

so  1/4 + 1/6 + x = 1/12 * 3 = 1/4

=>     x = -1/6

After subtraction of some quantity from the sum 5/12 we get  -1/6.

To obtain -1/6 from the sum 5/12 we have to subtract 5/12 - (-1/6)

   = 7/12.