Question

Students were surveyed about their favorite colors one fourth of the students preferred red 1/8 of the students preferred blue, and3/5 of the remaining students preferred green. If 15 students prefer green how many students were surveyed

Answer 1

25 students were surveyed in total.

make all the fraction have the same denominator and you will get 3/5=24/40
1/4=10/40 and 1/8=5/40. 

24/40 is equal to 60%

therefore 15 kids like the color green which is the same thing to 60% of the kids asked like green. 15 is 60% of 25, therefore 25 kids were serveyed