Two days ago, Uncle Welly planted 50 roses on his vacant lot. Yesterday, he planted 20 more roses than the previous day. Today, he planted twice the number of roses than two days ago. How many roses did Uncle Welly plant in his vacant lot? Give the rationale and then the answer.
Let's think step by step. Yesterday, Uncle Welly was able to plant 50 + 20 = 70 roses. Today, he planted 2 x 50 = 100 roses. Therefore, Uncle Welly has 50 + 70 + 100 = 220 roses planted on his vacant lot.. The answer is: 220.

Kenny played 10 hours of basketball last week. He ran for twice as long as he played basketball, and he practiced on the trumpet for twice as long as he ran. How many hours did Kenny practice on the trumpet last week? Give the rationale and then the answer.
Let's think step by step. Kenny ran for 10 * 2 = 20 hours. Kenny practiced the trumpet for 20 * 2 = 40 hours.. The answer is: 40.

Adam needs a new laptop and has two choices. The first laptop is $500, and the second laptop is 3 times as costly as the first laptop. How much would Adam have to spend if he decides to buy both? Give the rationale and then the answer.
Let's think step by step. The second laptop costs $500 * 3 = $1500. Adam needs to spend $1500 + $500 = $2000 for both.. The answer is: 2000.