Question

in a class of 45 students, 20% students were absent. how many students were present.​

Answer 1

Total number of students = 45

percentage of Absent students = 20%

Percentage of Present students =

⠀⠀⠀⠀⠀⠀⠀ 100% -20%= 80%.

so , 80% of 45 = 80 × 1/100 × 45

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀= 36

therefore 36 students were present.

hope it helps you..

Answer 2

• As per the data given in the question, we have to determine the number of present students.

       Given data:-  Strength of class=$45.$

                             Absent students=$20\%.$

        To find:- The number of students are present?

         Solution:-

•  A percentage is a fraction of an amount expressed as a particular number of hundredths of that amount.  It is denoted by $\%$ . $1 \%$ means $\frac{1}{100}.$

• We are using the unitary method to calculate the percentage of numbers.

        According to condition,

        $20\%$ students were absent out of $45$ students.

        $\Rightarrow 45\times\frac{20}{100}=9\\\Rightarrow 45-9=36.$

     Hence, $36$ students were present.