Question: 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?
Answer: 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.
So the answer is 12.

Question: On our last vacation, I bought 4 times as many tetras as Tim bought clowns. Tim bought twice as many clowns as Rick bought guppies. If Rick bought 30 guppies, how many animals did we buy on our last vacation?
Answer: Step-by-step reasoning process: If Rick bought 30 guppies, Tim bought 2 clowns / guppy * 30 guppies = 60 clowns. The total number of tetras bought by you is 4 tetras / clown * 60 clowns = 240 tetras. In total, the three bought 240 tetras + 60 clowns + 30 guppies = 330 animals.
So the answer is 330.

Question: John buys 3 reels of 100m fishing line. He cuts it into 10m sections. How many sections does he get?
Answer: Step-by-step reasoning process: He buys 3 * 100 = 300m. So he gets 300 / 10 = 30 sections.
So the answer is 30.

Question: Lily had $55 in her account. She spent $7 on a shirt. She then went to another shop and spent thrice as much as she spent on a shirt. How much money is left in Lily's account?
Answer:
Step-by-step reasoning process: After spending money on a shirt, Lily had $55 - $7 = $48 left. She spent $7 x 3 = $21 on another store. Therefore, she only has $48 - $21 = $27 left on her account.
So the answer is 27.