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A survey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand X aspirin. How many doctors use brand X aspirin?
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A survey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand X aspirin. How many doctors use brand X aspirin?

User Christian Beikov
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1 Answer

5 votes
This is a proportion problem that involves cross-multiplication
Set your problem up like so:

(x)/(2,000) =
(3)/(5)

Now cross multiply
2,000 x 3 = 6,000
now you're left with 5x = 6,000
Now divide by 5 on both sides
Answer is 1,200
User John Mills
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7.1k points
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