Question

You and your brother are reading the same novel. You want to get ahead of him in the book, so you decide to read 303030 minutes longer than your brother reads. Write an equation for the number of minutes you read, yyy, when your brother reads xxx number of minutes. How many minutes will you read if your brother reads for 151515 minutes? minutes

Answer 1

Equation= y=x+30

You Will read for 45 minutes

This is straight from Khan Academy

Answer 2

You will read for 45 minutes if your brother reads for 15 minutes.

Explanation

You decide to read 30 minutes longer than your brother reads.

If your brother reads $x$ number of minutes, then 30 minutes longer than $x$ minutes means $(x+30)$ minutes.

As the number of minutes you read is $y$ , so the equation will be:  $y= x+30$

When your brother reads for 15 minutes, then we will just plug $x=15$ into the above equation. So.....

$y=15+30= 45$

So, you will read for 45 minutes if your brother reads for 15 minutes.