Sarah's external drive showed 2.4 gigabytes free and 12.6 gigabytes used. She decided to delete a folder of size 4.6 gigabytes and store new files of 2 gigabytes. If she will transfer all her files to a new external drive of size 20 gigabytes, how many free gigabytes will the new external drive have?
Step-by-step reasoning process below:
10
There were 12.

6 - 4.

6 = 8 gigabytes used after deleting some files.

Then, the used space went up to 8 + 2 = 10 gigabytes after storing other files.

Thus, the new 20 gigabytes external drive will have 20 - 10 = 10 gigabytes free.

.

The answer: 10