Let x be the number :) . Let's write it this way:
1/3x = 8
(3) 1/3 x = 8 (3)
x = 24
Now knowing this, we now solve for the value of 1/4 of the number
24 x 1/4 or 24 x 0.25
=6
Adding the two numbers...
24 + 6 = 30
Therefore, 30 is the correct answer :)