At the newest animated movie, for every 9 9 children, there are 4 4 adults. there are a total of 3 9 39 children and adults at the movie. how many children are at the movie?

27 children.

Step-by-step explanation:

For every 9 children there are 4 adults .

x + y = 39  where x = number of children and y = number of adults.

and x/y = 9/4

so  4x = 9y

then x =  9y/4 , so substituting for x in the first equation:-

y + 9y/4 = 39        Multiplying through by 4:-

4y + 9y =  156

y = 156/13 = 12  so there are 12 adults

and 39 - 12 = 27 children

its 4 because 2 times 2 is 4, if you double the number two you get four