Q: For this month, Lily wants to finish reading twice as many books as she finished last month. If she finished reading 4 books last month, what will be the total number of books that she will finish for two months?
A: This month, Lily wants to finish reading 4 x 2 = 8 books. So, for two months, she will finish reading 4 + 8 = 12 books. The answer is 12.

Q: Bart makes a mixtape. The first side has 6 songs. The second side has 4 songs. Each song is 4 minutes. How long is the total tape?
A: There are 6 + 4 = 10 songs on the tape. In total, the time is 10 * 4 = 40 minutes. The answer is 40.

Q: Pete walked 5 blocks from his house to the bus garage in Houston. He rode the bus 20 blocks to the post office to get some stamps. Later, he came home the same way. How many blocks did Pete travel in all?
A:
The number of blocks traveled on the way to the post office was 5 + 20 = 25. Pete traveled 25 × 2 = 50 blocks in all. The answer is 50.