Final answer:
To find the value of x, subtract the time spent on other activities from the total time. From the given information, Kenny had a total of 140 minutes. Therefore, the value of x is 70.
Step-by-step explanation:
To find the value of x, we need to subtract the time spent on other activities from the total time. From the given information, we know that Kenny had a total of 140 minutes to read, do homework, and play video games. So, the equation would be 140 - x = x.
Simplifying the equation, we get 140 = 2x.
Dividing both sides by 2, we find that x = 70 minutes.
So, the value of x is 70.