You have to determine the probability that a beanbag that is chosen at random is made of suede, given that the beanbag is filled with beads.
Symbolically:

Since we already know that the beanbag is filled with beads, instead of working with the whole sample, you have to work with the bags that were filled with beads:
The probability can be determined as the quotient between the bags made of suede and filled with beads and the total number of bags filled with beads:
