30% of the men are more than 25 years old and 80% of the men are less than or equal to 50 years old. 20% of all men play football. If 20% of the men above the age of 50 play football, what percentage of the football players are less than or equal to 50 years?
A. 70%
B. 15%
C. 80%
D. 20%
E. 90%

• 
  Answer - (C)
  
  Solution:
  
  20% of the men are above the age of 50 years. 20% of these men play football. Therefore, 20% of 20% or 4% of the total men are football players above the age of 50 years.
  
  20% of the men are football players. Therefore, 16% of the men are football players below the age of 50 years.
  
  Therefore, the % of men who are football players and below the age of 50=(16/20)×100= 80%
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