Final answer:
Reese used 435 minutes in total.
Step-by-step explanation:
Reese used 80% of her minutes to call her mother, which was 348 minutes. To find the total number of minutes she used, we can set up a proportion:
80% = 348 / x
To solve for x, we can cross multiply:
0.8x = 348
Dividing both sides by 0.8 gives:
x = 348 / 0.8
x = 435
Therefore, Reese used a total of 435 minutes.