With reference to an earlier question:-

The liquid is to be scooped at a quarter of the depth of the container it is in. Hence the first sentence is correct? Or is there a better way of phrasing? The liquid should be scooped at a quarter depth of the container?

Posted by ann on Tuesday, October 26, 2010 at 5:31pm
The liquid should be scooped at a quarter depth.
or
The liquid should be scooped at a quarter depths.

Which is correct?
• English - Writeacher, Tuesday, October 26, 2010 at 5:38pm
I think it depends on what this means. I think it'll be the first sentence, but it's not really clear.

a quarter of the depth of the measuring cup?

a quarter of the depth of the container the liquid is in?

the depth of the size of a US quarter ($.25)?
What?

Based on the context you provided, it seems like you want to clarify how to accurately phrase the instruction to scoop the liquid at a quarter of the container's depth.

To make it clear and concise, you can say, "The liquid should be scooped at a depth equal to one-quarter of the container." This phrasing communicates that the depth of the liquid to be scooped should be one-fourth of the depth of the entire container.