Question 984019
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>>At first two different pipes will fill a tank in 20/3 minutes,
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That sentence is ambiguous:

It could be taken as:
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>>At first two different pipes EACH will fill a tank in 20/3 minutes,
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or it could be interpreted as
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>>At first two different pipes TOGETHER will fill a tank in 20/3 minutes,
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We can't tell which it is.  Tell us which it is and we'll help you.

Edwin</pre>