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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 is the fraction of the teenagers mainly exercise by walking?
Bot GPT 3.5
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Let's find the fraction of teenagers that mainly exercise by walking.
If 2/3 of teenagers said they got regular exercise, then 2/3 * 4/5 = (2*4) / (3*5) = 8/15 of teenagers mainly exercise by walking. Answer: \boxed{\frac{8}{15}}.