How do I pronounce "ratio 1:1"?
Should I pronounce it "ratio 1 to 1"?
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In speech this is obviously always pronounced "ratio one to one."
In writing, it is a matter of style. Anything of a technical nature should always be written in the 1:1 form, but when writing prose, fiction or something informal, you should certainly consider writing it as it would be spoken:
"The mix was applied in a one-to-one ratio."
The use of hyphenation and words instead of numerals makes the sentence flowing and readable, and encourages the reader's eye to see this as a single, commonly-occurring term.
Note that for the purpose of clarity ratios should generally be stated in the same clause and the same order as the two sets being compared:
"Boys and girls were present in a ratio of 3:2."
You would pronounce it "a ratio of 1 to 1", but it's worth noting that there are sometimes exceptions.
In films and photography, for example, ratios such as 16:9 and 4:3 are often described as "16 by 9" and "four by three", respectively.
In the United States, "one-to-one ratio" is preferred. A pronunciation of "ratio" is given at the following.
In addition, The American Heritage Dictionary shows both a two-syllable and three-syllable pronunciation for ratio.