# GMAT Prep From Platinum GMAT

### GMAT Prep Materials

### Announcement

Check out our latest blog post about The Best GMAT Books for Studying on Your Own.

### About Us

Platinum GMAT Prep provides the best GMAT preparation materials available anywhere, enabling individuals to master the GMAT and gain admission to any MBA program. We also provide hundreds of pages of free GMAT prep content, including practice questions, study guides, and test overviews.

Louis has written four papers, on which he has received an average of 78%. His lowest-scoring paper is automatically dropped. After dropping, his average for the three remaining papers is 84%. What was the score of his lowest-scoring paper?

Correct Answer:

**E**Set up equations for the averages before and after dropping.

- Let T be the total score of the four papers

Let d be the score of the dropped paper. - The average of all four papers:

T / 4 = 78 - Solve for T:

T = (4)(78)

T = 312 - After the lowest paper, d, is dropped, the sum of the three remaining papers is: T - d.
- The average of the remaining three papers:

(T - d) / 3 = 84

Since we know T:

(312 - d) / 3 = 84 - Solve for d:

Multiply by 3: (312 - d)= 3(84)

312 - d = 252

312 - 252 = d

d = 60 - Answer choice E is correct.