6-55. When Lakeesha solved the equation 3(x+1)=12 from problem 6-54,she reasoned this way: "Since 3 groups of (x+1) equals 3 groups of 4, then I know that each group of (x+1) must equal 4."

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.