Question

the ratio of students who wear glasses to the total class is 2:5 if there are 15 students who don't wear glasses how many students are in the class

Answer 1

Answer: 25 students

Step-by-step explanation:

The students who don't wear glasses to the whole class is 3:5. If 15 is the '3' then 25 would be the 5.

Answer 2

Answer:

25

Step-by-step explanation:

Given: The ratio of students who wear glasses to the total class is $2:5$

To Find: If there are $15$ students who don't wear glasses how many students are in the class.

Solution:

Let total students in class are$=\text{t}$

fraction of students of total class who wear glass$=\frac{2}{5}$ $\text{t}$

fraction of students of total class who don't wear glass$=1-\frac{2}{5}$ $\text{t}$

                                                                                           $\frac{3}{5}$ $\text{t}$

Number of students who don't wear glass$=15$

                    $\frac{3}{5}\text{t}=15$

                    $\text{t}=\frac{5}{3}\times15$

                    $\text{t}=25$

Hence there are $25$ students in the class