Find the mean of the following set of numbers 1/9, 7/3, 1/4, 1/12

The mean is 25/36.

Step-by-step explanation:

You add all the fractions and divide that sum by the amount of numbers you added together so it'd be (1/9+7/3+1/4+1/12)/4

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: