At the cubs/white sox baseball game on sunday night, 65% of the fans were men. another 25% were women. of the remainder, 40% were boys and the rest were girls. if 640 boys attended the game, what was the total number of people in attendance?

Ok, 65% of the attendants were men, 25% were women.

That leaves us with 10% remaining. 

From those 10% The problem tells us that 40% are boys

So 10% * ( 0.4 ) = 4% This means that 4% of the total attendants were boys.

So the distribution is

65%men
25%women
4%boys
6%girls

640 boys attended the game> this means that 4% of the total amount of people is 640.

So the number of persons that attended were

T= 100% *(640)) / 4% = 16000 people