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प्रश्न
Solve the following.
There are 500 students in the school in Dahihanda village. If 350 of them can swim, what percent of them can swim and what percent cannot?
बेरीज
उत्तर
Total number of students in the school = 500
Number of students who can swim = 350
Suppose the students who can swim are x %. Let us write in two forms the ratio of the number of students who can swim to the total number of students in the school, obtain an equation and solve it. Then, we have
`"x"/100 = 350/500`
`⇒ "x"/100 xx 100 = 350/500 xx 100`
⇒ x = 70
∴ Percentage of students who can swim is 70%.
Now, percentage of students who can not swim = (100 − 70)% = 30%
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