Solution:

Total words are 170 + 75+60+55=360.

Each week, Sofia is test with 15 words from the list.

Total number of weeks it will take to finish the test is 24.

Average number of weeks in a year is 25 approximately.

Seven weeks are already over, that means \(\displaystyle{15}\times{7}={105}\) words are covered from the list. Conclusion:

Remaining words are 360—105=255.

These words can be covered in a group of 15 in a week, so \(\displaystyle\frac{255}{{15}}={17}\) are the number of weeks.

Therefore, the number of words that Sofia will be tested on before the end of the year is 255.

Total words are 170 + 75+60+55=360.

Each week, Sofia is test with 15 words from the list.

Total number of weeks it will take to finish the test is 24.

Average number of weeks in a year is 25 approximately.

Seven weeks are already over, that means \(\displaystyle{15}\times{7}={105}\) words are covered from the list. Conclusion:

Remaining words are 360—105=255.

These words can be covered in a group of 15 in a week, so \(\displaystyle\frac{255}{{15}}={17}\) are the number of weeks.

Therefore, the number of words that Sofia will be tested on before the end of the year is 255.