Question

The ratio of students who wear glasses to the total class is 2 : 5.
What is the ratio of students who wear glasses to those who don’t?

Answer 1

Step-by-step explanation:

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n = # of students total

w = # without glasses = 25

n-25 = # with glasses

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n-25:n = 2:5

or,

(n-25)/n = 2/5 (same thing)

5(n-25) = 2n

5n - 125 = 2n

3n = 125

n = 125/3

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There's no integer solution.

If n = 41:

16/41 <> 2:5 (2:5 = 16:40)

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If n = 42:

17:42 = 0.40476, not 2:5 which is 0.4

Answer 2

Answer:

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=t fraction of students of total class who wear glass=t fraction of students of total class who don't wear glass= 1- t Number of students who don't wear glass= 15 t = 15 t =} x 15 t = 25 Hence there are 25 students in the class