Question 1204285
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<pre>

After 1st stroke, 5/6   of the initial air mass remains;

After 2nd stroke, {{{(5/6)^2}}} of the initial air mass remains;

After 3rd stroke, {{{(5/6)^3}}} of the initial air mass remains;

After 4th stroke, {{{(5/6)^4}}} of the initial air mass remains;

After 5th stroke, {{{(5/6)^5}}} of the initial air mass remains;

After 6th stroke, {{{(5/6)^6}}} of the initial air mass remains, or  0.3349  of the initial air mass remains  (rounded).    <U>ANSWER</U>
</pre>

Solved.



For similar (TWIN) solved problems, see the links


https://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.1097807.html


https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.75801.html


at this forum.



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Regarding the post by @MathLover1, I recall this medical proverb: 


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a drop of nicotine kills a horse.



Likewise, @MatnLover1's answer may kill a reader.
He will die if not from horror to have such a &nbsp;" tutor ", &nbsp;then from laughter.



&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;So, &nbsp;for safety of your mind, &nbsp;you better ignore her post.