Question 1154557
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            In his solution, @josmicely made several errors on the way.


            His check is  FALSE,  also,  and is not  "the check",  at all.


            For correct solution see the post by Alan.



The correct answer is

<pre>
    after 15 hours, the height of the candle was 16.5 cm.
</pre>

It is clear practically without calculations.


In &nbsp;3 hours between &nbsp;15 &nbsp;hours and &nbsp;18 &nbsp;hours, &nbsp;the height of the candle decreases by &nbsp;0.5*3 = 1.5 cm.


Therefore, &nbsp;at the &nbsp;15 &nbsp;hours time moment, &nbsp;the height of the candle was &nbsp;15 + 1.5 = 16.5 cm.    &nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>


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@josmicely, please do not consider my post as a trial to make a war with you.


Simply, at this forum we should have a protection service for visitors from errors of tutors ---


so, I perform this protection service . . . from time to time . . .