Answer:
2/10 or 20% chance to pick a yellow marble
Well figure it out yourself because you need to not fall asleep in class. It has happened to me before and I had to control myself!!
Step-by-step explanation:
n - 7 = 21, n= 28 should be right bc the difference of 28 and 7 is 21
either the second one or the fourth one. good luck
