5 schools sent some students to a conference
one of the schools sent both boys and girls
this school sent 16 boys
the ratio of boys to girls that it sent was 1 : 2
the other 4 schools sent only girls
each of the 5 schools sent the same number of students
work out the total number of students sent to the conference by these 5 schools
(How the Feck do you do this, I need it to be explained dumbed down)