gwendolyn had slept 2 hours less than normal for each of the last 3 nights. If she's slept a total of 15 hours for all 3 nights, how many hours does she normally sleep per night?
To find out how many hours Gwendolyn normally sleeps per night, we can set up an equation based on the given information.
Let's denote the number of hours Gwendolyn normally sleeps per night as "x."
According to the problem, Gwendolyn has slept 2 hours less than normal for each of the last 3 nights. This means that her sleep duration for each night can be represented as (x - 2).
Since she slept a total of 15 hours for all three nights, we can write an equation:
(x - 2) + (x - 2) + (x - 2) = 15
Simplifying the equation:
3x - 6 = 15
Add 6 to both sides of the equation:
3x = 21
Divide both sides of the equation by 3:
x = 7
Therefore, Gwendolyn normally sleeps 7 hours per night.