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As we know that the percentage of good students is \[72\% \] and in total there are 25 students.

So, the percentage students not good in mathematics are,

\[

= (100 - good\% ) \\

= (100 - 72)\% \\

= 28\% \\

\]

Hence, in order to calculate the number of students who are not good at maths, we need to calculate a total \[28\% \]of 25

students.

As, \[n\% ofA = \dfrac{n}{{100}} \times A\], using this we get,

\[ \Rightarrow \] Number of students who are not good in maths\[ = \dfrac{{28}}{{100}} \times 25\]

On simplification we get,

\[ \Rightarrow \]Number of students who are not good in maths\[ = \dfrac{{28}}{4}\]

On dividing 28 by 7 we get,

\[ \Rightarrow \]Number of students who are not good in maths\[ = 7\]

Hence,

As the percentage can be given by,

\[\dfrac{{n(notgood)}}{{n(total)}} = \dfrac{x}{{100}}\]

Hence, the total number of not good students in maths can also be calculated.

Thus, do the calculation properly without any mistake.

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