Answer:
Henry has read per minute 3 pages.
Explanation:
Given:
Henry is an avid reader. He devours 90 pages in half-an-hour.
Now, to find pages Henry has read per minute.
Let the number of pages Henry has read per minute be
![x.](https://img.qammunity.org/2021/formulas/mathematics/middle-school/mmi228653dkvma4dszwy75q6dvkduzr4zg.png)
Number of pages he devours in half-an-hour = 90 pages.
So, as half an hour is 30 minutes.
Thus, number of pages he devours in 30 minutes = 90 pages.
Now, to get the pages he has read per minute:
According to question:
![30x=90](https://img.qammunity.org/2021/formulas/mathematics/middle-school/k3vpl8w51br7pt9s9ry36l9u21o3igyozh.png)
Dividing both sides by 30 we get:
![x=3.](https://img.qammunity.org/2021/formulas/mathematics/middle-school/7u08v9ds1zk9e0vazsc8ixzg7gowx5gopv.png)
Therefore, Henry has read per minute 3 pages.