Percentage of students interested in mathematics = 72 % ⇒ Percentage of students not interested in mathematics = 100 72 = 28 % Total no. of st ...

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Standard VII

Mathematics

Percentages

Question

$72$ % of $25$ students are interested in mathematics. How many are not interested in mathematics

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Solution

Percentage of students interested in mathematics $= 72 %$
$\Rightarrow$ Percentage of students not interested in mathematics $= 100 - 72 = 28 %$
Total no. of students $= 25$
Therefore,
No. of students not interested in mathematics $= \frac{28}{100} \times 25 = 7$
Hence $7$ students are not interested in mathematics.

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

In a class of 30 students, 20 of them are interested in mathematics, 25 students are interested in social science. Find out the number of students who are interested in both and show the same through a Venn diagram.

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

Percentage of students interested in mathematics =72%⇒ Percentage of students not interested in mathematics =100−72=28%Total no. of students =25Therefore,No. of students not interested in mathematics =28100×25=7Hence 7 students are not interested in mathematics.

$72$ % of $25$ students are interested in mathematics. How many are not interested in mathematics