# 3  72% of 25 students are interested in mathematics. How many are not interested in mathematics?

Given;

72% of 25 students are interested in mathematics

$\therefore$ Percentage of students not interested in mathematics = (100 - 72)% = 28 %

$\therefore$ The number of students not interested in mathematics = 28% of 25

$=\frac{28}{100}\times25 = \frac{28}{4}$

$= 7$

Therefore, 7 students (out of 25) are not interested in mathematics.

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