The table shows the books in Tashonda's bookcase. If Tashonda takes a paperback book from her bookcase without looking, find the probability that it is a mystery. Express your answer as a decimal rounded to the nearest hundredth

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.