Question

75% of the students in a class passed an exam .If two more students had passed the exam 80% would have been successful . How many students are there in the class

Answer 1

5% of the total students=2
1% of the total students =2/5
100 % of the total students=(2/5)*100
=40.

Answer 2

Answer:

40

Step-by-step explanation:

Given : 75% of the students in a class passed an exam

To Find:If two more students had passed the exam 80% would have been successful . How many students are there in the class

Solution:

Let x be the number of students

We are given that 75% of the students in a class passed an exam.

So, no. of students passed the exam = $\frac{75}{100}x$

Now we are given that If two more students had passed the exam 80% would have been successful

$\Rightarrow \frac{75}{100}x+2=\frac{80}{100}x$

$\Rightarrow 2=\frac{80}{100}x- \frac{75}{100}x$

$\Rightarrow 2=\frac{5}{100}x$

$\Rightarrow 2 \times \frac{100}{5}=x$

$\Rightarrow 40=x$

Hence there are 40 students in the class.