At a conference, half of the speakers are scientists and a third are engineers. The rest are artists, and no speaker belongs to more than one group. There are 60 speakers.
How many of the speakers are artists?
Answer and explanation
Correct answer: B. 10
- Step 1: Scientists: 30; engineers: 20. Step 2. 60 - 30 - 20 = 10 artists. Answer: 10. Why not the others: these come from using the wrong fractions.
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