In a survey of teenagers 2/3 responded that they get regular exercise and 4/5 of those said that walking was the main form of exercise what fraction of the teenagers mainly exercise by walking
To find the fraction of teenagers who mainly exercise by walking, we first need to find the fraction of teenagers who get regular exercise and then multiply that by the fraction of those who say walking is their main form of exercise.
Fraction of teenagers who get regular exercise = 2/3
Fraction of those who say walking is their main form of exercise = 4/5
Fraction of teenagers who mainly exercise by walking = (2/3) * (4/5)
= (8/15)
Therefore, the fraction of teenagers who mainly exercise by walking is 8/15.