
First, subtract '11' from each side.

Second, subtract '29 - 11' to get '18'.

Third, since we are solving for f, we have to get it by itself. Multiply each side by 'f'.

Fourth, once again, we need to get 'f' alone. Divide both sides by 18.

Fifth, now that we have 'f' by itself, we can simplify the current fraction. To do so, we need to start off with listing the factors of 4 and 18 and find the greatest common factor (GCF).
Factors of 4: 1, 2, 4
Factors of 18: 1, 2, 3, 6, 9, 18
Out of the listed factors, 1 and 2 are the common factors, and since 2 is the highest number out of them, it is considered the greatest common factor. The GCF is 2.
Sixth, divide the numerator and denominator by the GCF (2).

Seventh, we can now rewrite our fraction in simplest form and switch sides.

Answer in fraction form:

Answer in decimal form:
The average of scores is 160.5
Step-by-step explanation:
Mean is the sum of all values divided by the number of values.
Given scores are:
138,151,198,147,156, and 173
The formula for average score is given by:

Putting values

The average of scores is 160.5
Keywords: Mean, Average
Learn more about mean at:
#LearnwithBrainly
75 +10n = 15n
75 = 5n
15 = n
Therefore 15 classes