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72% of 25 students are good in mathematics. How many are not good in mathematics?

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It is given that 72% of 25 students are good in mathematics.

Therefore,

Percentage of students who are not good in mathematics = (100 − 72)% = 28%

Number of students who are not good in mathematics = 28/100 x 25 = 7

Thus, 7 students are not good in mathematics.

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