Students at central school were surveyed regarding lunch choices. of the students that responded, exactly 1/3 wanted more fresh fruits and vegetables as
choices. of those students not wanting more fresh fruits and vegetables, exactly 1/8 wanted more seafood. what is the minimum number of students that responded to the survey?

If 1/3 of the students wanted more fruits and veggies, then that means that 2/3 did not. And of that 2/3, 1/8 of them wanted more seafood.  This means that 1/12 of all the students surveyed wanted more seafood and 1/3 wanted more fruits and veggies. The least common multiple of 3 and 12 (or the LCD of the two fractions) would be 12.
Multiplying by 12, we figure out that 4 of them would have wanted more fruits and veggies and only 1 lonely kid wanted more seafood.
Final answer : 12