The number of students who take both the subjects mathematics and chemistry is 30. This represents 10% of the enrolment in mathematics and 12% of the enrolment in chemistry. How many students take at least one of these two subjects ?
Updated On: Jul 7, 2022
520
490
560
480
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The Correct Option isA
Solution and Explanation
Let $x$ be the number of students who take mathematics and $y$ be the number of students who take chemistry.
$30=\frac{10}{100}\left(x+30\right)$$ \Rightarrow x=270$
Similarly, $30 = \frac{12}{100}\left(y+30\right)$$\Rightarrow y= 220$
Number of students who take atleast one of these two subjects
$= 270 + 220 + 30 = 520 $
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