Question

00:00 Ashley’s math average decreased 12 points to 78. Then she completed an extra credit assignment and raised her final average by 5 points. How did Ashley’s average change? What was her starting average? What was her final average?

Answer 1

we are given

Ashley's average decreased by 12 points

Average after decreasing is 78 points

Then she completed an extra credit assignment and raised her final average by 5 points

(A)

Ashley's average will only increased when it's last assignment will get more than average of previous assignment points

Here , it is increasing aveage by 5 points

so, it's last assignment will have more than 78 points

then only it's final average will increase

(B)

Ashley's average decreased by 12 points

Average after decreasing is 78 points

so, previous average = 78+12=90 points

(C)

Final average = average after decreasing + average raised by extra credit assignment

so, we get

Final average =78+5

Final average =83..................Answer

Answer 2

We want to perform some algebraic operations.

We will get:

• Initial score = 90
• Final score = 83
• Change = -7

Let's define S as Ashley's original score.

We know that first, her average decreased 12 points to 78.

Then we can write:

S - 12 = 78

Now we can solve this for S:

S = 78 + 12 = 90

S = 90

Her original score is 90.

Then her score increases 5 points, then her final score is:

78 + 5 = 83

How did Ashley's average change?

We just need to find the difference between the final score and the initial score, we will get:

83 - 90 = -7

This means that Ashley's score decreased by 7 points.

What was her starting average?

90 points

What was her final average?

83 points

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