Given:
Number of emails sent after first day= 127 e-mails
The count increased by 10.
To find how many she will send after 3 weeks, use the formula:
Let's convert 3 weeks to days = 3 * 7 = 21 days
Thus, we have:

Therefore the number of mails she sent after 3 weeks is 337 e-mails.
ANSWER:
337