Question

In an online Mathematics practice test, Alexa scores $20$ points for the questions she answered correctly, and gets $-3$ points for each incorrect answers. Alexa answers $4$ questions incorrectly. What is Alexa's final score?

• A. $20$ points
• B. $17$ points
• C. $8$ points
• D. $-12$ points

Answer 1

The correct option is C $8$ points

$\bullet$ Points gained by Alexa for attempting questions correctly $=20$ points

Points for attempting each incorrect answer $=-3$ points
Total number of questions attempted incorrectly by Alexa $=4$

$\bullet$ Points lost by Alexa for attempting $4$ questions incorrectly
$=(-3\times 4)$ points
$=-12$ points

Total score of Alexa would be obtained by adding the score of attempting questions correctly to the score of attempting questions incorrectly.

$\therefore$ Total final score of Alexa
$=(20+(-12\left)\right)$ points
$=8$ points

Hence, the total final score of Alexa in the online Mathematics practice test is $8$ points, i.e., (c.) is the correct option.