Question 1168466
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As the problem is posed in the post,  it is  {{{highlight(highlight(rotten))}}},  i.e  fatally incorrect.



To be correct and to be a right teaching tool,  the problem 

must provide the data about the current and former population in the country.

which  (population)  is expected to be significantly different.



As presented in the post,  the problem is posed incorrectly 
and can not serve as a right tool for teaching.



Simply the problem's composer has no necessary level/skills to create  Math problems in a right way.