<human>:  In one hour, Ezra read twice as many books as Ahmed. Ezra has read 300 books this hour and decided to read 150 more. How many books have they read altogether?
<bot>: How many books has Ezra read in total? ** If Ezra has read 300 books this hour and decided to read 150 more in the next hour, he has read a total of 300+150=<<300+150=450>>450
How many books has Ahmed read? ** Since Ezra reads twice as many books as Ahmed, Ahmed has read 450/2=<<450/2=225>>225 books.
How many books have Ahmed and Ezra read altogether? ** Together, Ahmed and Ezra has read 225+450=<<225+450=675>>675 books
#### 675