MATH
posted by DAni .
The ratio of graduate students to undergraduate studaent at a certain university is 4 to9. if there are 2340 students at the university how many undgergraduates are there?

It's a ratio, so ...
http://www.aaastudy.com/rat.htm#topic7
4/9 = x/2340 
Sorry, but that equation is not correct
let the number of graduate students be 4x, let the number of undergrads be 9x
so 4x+9x = 2340
13x = 2340
x = 180
so number of undergraduates = 9x = 1620
(graduate students = 4x = 720)
notice 720:1620 = 4:9 
Thanks, Reiny.