Santina measured the amount of sugar in four containers 20 ounces 16 ounces 1 pound and 12 ounces how much sugar in the four containers combined

Jane is cooking beans and rice for dinner tonight. she has 4 cans of black beans, 6 cans of red beans, and 3 cans of garbanzo beans in her cupboard. if she grabs a can of beans without looking at the label, what is the probability of her making black beans and rice for dinner?