8th grade
posted by Anonymous .
Suppose that the veterans of the Korean War and the veterans of WWII are mutually exclusive. Together, the veterans of the Korean War and the veterans of WWII, account for X% of the veterans in the United States in 2009. The number of veterans of the Vietnam era is X% + 11.6% in 2009. What is the number of Vietnam era veterans in the United States in 2009? Express your answer to the nearest whole number.

We are told that together, the number of Korean War and WWII veterans in 2009 is X%. Using the information from the previous problem we have X% = 12.4% + 10.7% = 23.1%. That means the number of Vietnam era veterans is 23.1% + 11.6% = 34.7% of the veterans in the United States in 2009. Thus, there were 21,854,374(0.347) = 7,583,467.778 ≈ 7,583,468 veterans of the Vietnam era in the United States in 2009.