Final answer:
The ratio of male to female students is 1:2. Therefore, the correct answer is B. 1:2.
Step-by-step explanation:
To find the ratio of male to female students, we need to set up a proportion based on the information given.
For every 10 male students, there are 20 female students. This can be written as:
Male students : Female students = 10 : 20
To reduce this ratio to its lowest terms, we divide both sides of the ratio by the greatest common factor (GCF) of 10 and 20, which is 10. This gives us:
Male students : Female students = 1 : 2
So, the ratio of male to female students is 1:2. Therefore, the correct answer is B. 1:2.
To find this ratio in the lowest terms, we divide both the number of male and female students by the greatest common divisor, which is 10 in this case. Therefore, the ratio of male to female students reduces to 1:2.