Either 4,000,000 or 3,794,000 I guess but it depends how accurate it is wanted to be. If they put it in a newspaper it'd probably be the first one
Boys:girls
3+1=4
1\4 x 100=25
answer=25%
< A = 40
< B is a complement of < A....so < B = (90 - 40) = 50
< C is a supplement of < B....so < C = (180 - 50) = 130
4 people email 3 more people each so 12 people are emailed, then these 12 people email 3 more people each, so 36 people are emailed.