The ratio of the arithmetic mean of two numbers to one of the numbers is 4:6. What is the ratio of the smaller number to the larger number?
Select:  A) 1:5  B) 1:4  C) 1:3  D) 1:2  E) 2:3
For two numbers, the arithmetic mean is the middle of the two numbers.   The ratio of the mean to the larger number is 4:6, thus the smaller number must have a ratio of 2.   The ratio of the smaller number to the larger number is 2:6 = 1:3.   The answer is 1:3.
<result>C</result>
The ratio of the arithmetic mean of two numbers to one of the numbers is 4:6. What is the ratio of the smaller number to the larger number?