The ratio of the arithmetic mean of two numbers to one of the numbers is 5:7. What is the ratio of the smaller number to the larger number?	Choices.
A) 2:3	B) 2:5	C) 3:7	D) 4:9	E) 5:6
For two numbers, the arithmetic mean is the middle of the two numbers.   The ratio of the mean to the larger number is 5:7, thus the smaller number must have a ratio of 3.   The ratio of the smaller number to the larger number is 3:7.   The answer is 3:7.
<result>C</result>
The ratio of the arithmetic mean of two numbers to one of the numbers is 5:7. What is the ratio of the smaller number to the larger number?