20 students including Tom take a test and Tom gets...

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20 students including Tom take a test and Tom gets 5.8 pts higher than their average score. If the teacher gives all the 20 students an additional 10 pts question and Tom is the only one who solved it correctly, how many pts is tom's average score higher than the average score of the total 20 students?

A. 6.2
B. 10.4
C. 10.5
D. 15.3
E. 16.2

The OA is D.

I need help with this PS question. Please, can any expert assist me with it? Thanks.
Source: — Problem Solving |