Is my answer to these dilution problems correct
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Is my answer to these dilution problems correct

[From: ] [author: ] [Date: 13-02-24] [Hit: ]
25ml/ .25 + 20ml = .25ml/ 20.25ml = 1/ 81. The final dilution is 1/81.-No,......
If .25ml of serum is diluted to 20ml, what is the final dilution?

I worked the problem like this: .25ml/ .25 + 20ml = .25ml/ 20.25ml = 1/ 81. The final dilution is 1/81.

-
No, "diluted to 20 mL" means that 20 mL is the total volume.
So the dilution is actually 0.25/20 = 1/80.
Your answer would be correct if the phrase was "diluted in 20 mL"
or 'diluted with 20 mL".
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