Question

In a survey of teenagers, 2/3 responded that they got regular exercise, and 4/5 of those said that walking was their main form of exercise. What fraction of the teenagers mainly exercise by walking?
A 1 7/15
B 8/15
C 6/8
D 3/4

Answer 1

To find the fraction of teenagers who mainly exercise by walking, we need to multiply the fraction of teenagers who said they got regular exercise (2/3) by the fraction of those who said walking was their main form of exercise (4/5).

Fraction who mainly exercise by walking = (2/3) * (4/5)
= 8/15

Therefore, the fraction of teenagers who mainly exercise by walking is 8/15.

The answer is B.