We have a question: 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?
And an answer: 50
So how you got the answer?
The number of blocks traveled on the way to the post office was 5 + 20 = 25. Pete traveled 25 2 = 50 blocks in all.

We have a question: Nancy can hula hoop for 10 minutes. Casey can hula hoop 3 minutes less than Nancy. Morgan can hula hoop three times as long as Casey. How long can Morgan hula hoop?
And an answer: 21
So how you got the answer?
Casey can hula hoop 3 minutes less than Nancy so she can hula hoop for 10 - 3 = 7 minutes. Morgan can hula hoop three times as long as Casey, who can hula hoop for 7 minutes, so she can hula hoop for 3 * 7 = 21 minutes.

We have a question: Maya loves to read books. Last week she read 5 books. Each book had 300 pages of text. This week she read twice as much. How many pages did Maya read in total?
And an answer: 4500
So how you got the answer?
Last week Maya read 5 * 300 = 1500 pages of text. This week she doubled the result, so she read 2 * 1500 = 3000 pages. In total Maya read 1500 + 3000 = 4500 pages of text.