In a class 70% students are present and 90 students are absent. Find total number of students

Questions : In a class 70% students are present and 90 students are absent. Find total number of students ?

Answer:  

 Here's a shortcut formula for such problems:

$$\text{Total Students} = \frac{\text{Number of Absent Students} \times 100}{\text{Percentage of Absent Students}}$$

Given:

• 90 students are absent
• 30% are absent

Applying the formula:

$$\text{Total Students} = \frac{90 \times 100}{30}$$ $$= \frac{9000}{30} = 300$$

Final Answer:

The total number of students in the class is 300.

Alternative way

Let the total number of students in the class be X.

Step 1: Given Information

• 70% of students are present, so 30% are absent.
• The number of absent students = 90.

Step 2: Set Up the Equation

Since 30% of X = 90, we write:

$$\frac{30}{100} \times X = 90$$ $$0.3X = 90$$

Step 3: Solve for X

$$X = \frac{90}{0.3}$$ $$X = 300$$

Final Answer:

The total number of students in the class is 300.

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