Question 9

Section A · 1 mark · 57% correct

The question in our own words · page 6

One day, \(m\) students walked to school and \(n\) came another way. \(20\%\) of the walkers and \(40\%\) of the others took at least 30 minutes. A student is chosen at random from those who took at least 30 minutes. What's the probability they walked?

  1. A\(\dfrac{m}{m+2n}\)
  2. B\(\dfrac{2n}{m+2n}\)
  3. C\(\dfrac{m}{5(m+n)}\)
  4. D\(\dfrac13\)
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