In a survey of teenagers, ⅔ responded that they got regular exercise, and ⅘ of those said that walking was their main form of exercise. What fraction of the teenagers mainly exercise by walking?

Answer 1

To find the fraction of teenagers who mainly exercise by walking, we need to multiply the fractions representing the proportions of teenagers who exercise regularly and of those who primarily walk.

The fraction representing the proportion of teenagers who exercise regularly is 2/3.
The fraction representing the proportion of those who mainly walk is 4/5.

Multiplying these fractions gives: (2/3) * (4/5) = 8/15.

So, 8/15 of the teenagers mainly exercise by walking.