72% of 25 students are good in mathematics. How many are not good in mathematics?
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Solution
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 xx 25`
= 7
Thus, 7 students are not good in mathematics.
Concept: Concept of Ratio
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