Question 244998
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I checked the solution by @MathTherapy to this problem, and I confirm that his solution and his answer 
to this problem  {{{21/5}}} = 4{{{1/5}}} = 4.2 are correct.


The final answer 23.4 in the post by @CPhill is INCORRECT.


In addition, the post by @CPhill is absolutely inappropriate due to its form, since critically important 
calculations are intentionally omitted. Such calculations should be presented explicitly -
without them, the post is a pure speculation.


More than strange a behavior of @CPhill at this forum.


I recommend to a reader to ignore the post by @CPhill.