Answer this question:Tyler has 21 CDs. He gives away a third of his CDs to his friend. Then he goes to the music store and buys 8 brand new CDs. How many CDs does Tyler have now?
Tyler gives away 21 / 3 = 7 CDs. After giving away a third of his CDs, Tyler has 21 - 7 = 14 CDs. After buying new CDs, Tyler has 14 + 8 = 22 CDs.
The answer is 22.

Answer this question:The school band has 30 songs in their repertoire. The band played 5 songs in their first set and 7 in their second set. The band will play 2 songs for their encore. Assuming the band plays through their entire repertoire, how many songs will they play on average in the third and fourth sets?
The band played 5 + 7 = 12 songs in their first two sets. They have 30 - 12 = 18 songs left for the third set, fourth set and encore. Since they played 2 songs in the encore, they have 18 - 2 = 16 songs to play on the third and fourth sets. They will play 16 / 2 = 8 songs on average over the third and fourth sets.
The answer is 8.

Answer this question:John writes 20 pages a day. How long will it take him to write 3 books that are 400 pages each?
He wants to write 3 * 400 = 1200 pages. So it will take him 1200 / 20 = 60 days.
The answer is 60.

Answer this question:Today, at the school science lesson, Jake learned that there are 8 more solar systems for every planet in the galaxy. If there are 20 planets in the galaxy, how many solar systems and planets are there altogether?
If there are 8 more solar systems for every planet in the galaxy, there are 8 + 1 = 9 solar systems for every planet. Since the number of planets is 20, there are 20 * 9 = 180 solar systems in the galaxy. Altogether, there are 180 + 20 = 200 solar systems and planets in the galaxy.
The answer is 200.