Question 1169655
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The formulation of the problem is incorrect grammatically,  logically and mathematically.



As formulated,  it is  AMBIGOUS,  which is  PROHIBITED  in  Math problems.




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After reading your post,  it is  UNCLEAR  to me,


<pre>
    who do not have cavities: these 70 children or that x children ?
</pre>

You may answer me : &nbsp;&nbsp;guess it on your own.


But I don't want to guess: &nbsp;It is &nbsp;Math, &nbsp;and &nbsp;I &nbsp;want to &nbsp;<U>KNOW</U> &nbsp;/ (to see) &nbsp;it from the text - not from the context.