Answer:
Step-by-step explanation:
Let equal the number of questions.
Let's find how many total questions there are:
Divide by the coefficient of , which in this case is
So we have a total of questions, each are worth points.
Now, Gianna got questions wrong, and if we know there are total questions...
Solve.
So we know Gianna got questions correct.
Let's use an expression to figure out her score.
Again, let equal the number of questions.
Substitute.
Multiply.