A baker bakes 6 medium sizes of cakes, which is cooked two ways, using charcoal oven fitting only 2/3 and the rest on electric oven. Charcoal oven has 1/5 chance
of getting the cakes cooked with in 45min, while electric oven has 2/3 chances. As
the cakes is served, Mrs. Belly don't have any idea if the cake is cooked on a
charcoal oven or electric oven.