Explanation:
i think there is something missing.
does this mean the 6 students paint 1/4 of the wall ?
so, each student then paints 1/6 of the 1/4 wall.
that means
1/4 / 6 = 1/4 / 6/1
now, remember, to divide by a fraction is the same as multiplying with the upside-down fraction.
so,
1/4 / 6/1 = 1/4 × 1/6 = 1/(4×6) = 1/24
every student is therefore painting 1/24 of the wall.