The circulation for magazine Z in 1971 was 6 times the average (arithmetic mean) yearly circulation for magazine Z for the years 1972-1980. What is the ratio of the circulation in 1971 to the total circulation during 1971-1980 for magazine Z ?	Pick one
A) 4/7  B) 5/7  C) 3/7  D) 2/7  E) 1/7
There are 9 years from 1972-1980, inclusive. Let's say the average circulation every year between 1972-1980 inclusive is x.   So the total circulation is 9x from 1972-1980, inclusive.   In 1971, the circulation is 6x.   So total circulation for 1971-1980 is 6x + 9x = 15x.   Ratio of circulation in 1971 to total circulation during 1971-1980 is 6x to 14x or 6/14 6  + 9= 
<gadget id="calculator"> 6  + 9</gadget>
<output>15</output>
15x.   Ratio of circulation in 1971 to total circulation during 1971-1980 is 6x to 14x or 6/14=3/7   Answer : 3/7
<result>C</result>
The circulation for magazine Z in 1971 was 6 times the average (arithmetic mean) yearly circulation for magazine Z for the years 1972-1980. What is the ratio of the circulation in 1971 to the total circulation during 1971-1980 for magazine Z ?