Q: Mary wants to ride the world's tallest roller coaster, Kingda Ka. The minimum height to ride the roller coaster is 140 cm. Mary's brother is 180 cm, Mary is 2/3 the height of her brother. How many more centimeters does Mary need to grow to ride Kingda Ka?
A: 20
Step-by-step reasoning process: Being 2 / 3 of her brother's height, Mary is 180 * 2 / 3 = 120 cm. To reach the minimum height and ride Kingda Ka, Mery needs to grow 140 - 120 = 20 cm.


Q: Monica and Michelle are combining their money to throw a party. Monica brings $15. Michelle brings $12. The cake costs 15 dollars, and soda is $3 a bottle. Each bottle of soda has 12 servings and they buy as many bottles of soda as they can afford. If there are 8 total guests, how many servings of soda does each get?
A: 6
Step-by-step reasoning process: They have $27 for the party because 15 + 12 = 27. They have $12 for soda because 27 - 15 = 12. They can buy 4 bottles of soda because 12 / 3 = 4. They have 48 servings of soda because 4 x 12 = 48. Each guest gets 6 servings because 48 / 8 = 6.


Q: A party hall has 3 decorative light bulbs; a red light bulb which comes on every 2 seconds, a green one every 3 seconds and a blue one every 4 seconds. If they are put on at the same time, what is the shortest time after which the three bulbs will be on at the same time?
A: 12
Step-by-step reasoning process: The blue light bulb comes on every 2 seconds so it will be on after 2, 4, 6, 8, 10, 12, 14... seconds (multiples of 2). The red light bulb comes on every 3 seconds so it will be on after 3, 6, 9, 12, 15, 18... seconds (multiples of 3). The blue light bulb comes on every 4 seconds so it will be on after 4, 8, 12, 16, 20... seconds (multiples of 4). The shortest time after which all three will be on is 12 seconds which is the least common multiple of the set of multiples.


Q: During a race transmitted on television, five advertisements were shown, lasting 3 minutes each. One minute of advertising costs $4000. What was the cost of transmitting these advertisements during the race?
A: 60000
Step-by-step reasoning process: During the race, there were five ads, lasting 3 minutes each, so in total, they lasted 5 * 3 = 15 minutes. So the total cost of these ads was 15 * 4000 = $60000.