The probability of getting a not clear marble out of the bag is given by the following expression
The number of not clear marbles in this case, will be the sum of black and white one (15+12=27), and all the possibilities will be the sum of the black, white and clear ones (15+17+6=33). Therefore the probability will be
In percentage and rounding to the closest number the probability will be 82%
how i did it was 12 + 15 + 6 is 33 and then 12 + 15 is 27 so it's 27 out of 33. then to find the percentage just divide 27 by 33 and multiply the answer by 100.