Ineed with a few questions for pre-calculus

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a