Question

At a local yoga studio, 80% of the members are women and 20% of the members are men. The average age of the women is 30 and the average age of the men is 40. What is the average age of all the members?

Answer 1

Ok, so lets suppose there are 10 people there:

8 are women
2 are men

The average of the total is:

$\frac{(30)(8) + (40)(2)}{10} = \frac{320}{10} = 32$