1 . In a certain population, there are times as many people aged 21 or under as there are people over 21. The ratio of those 21 or under to the total population is :

• A. 1 to 2
• B. 1 to 3
• C. 1 to 4
• D. 2 to 3
• D. 3 to 4

Answer: Option E

Explanation:

Let the number of people over 21 years be x. 
Given that the number of people aged 21 or under  =  3x 
So total population  =  4x 
Required ratio  =  3x : 4x  =  3:4 
So the answer choice is (e) 3 to 4.