Question

The average of Paula’s two test scores must be 80 or more for her to get at least a B in the class. She got a 72 on her first test. What grades can she get on the second test to make at least a B

Answer 1

Answer:

88

Step-by-step explanation:

Explanation:

I'll use the average formula to find the answer to this.

average

=

sum of grades

number of grades

She had a test with a score of  

72

, and a test with an unknown score  

x

, and we know that her average has to be at least  

80

, so this is the resulting formula:

80

=

72

+

x

2

Multiply both sides by  

2

and solve:

80

×

2

=

72

+

x

2

×

2

160

=

72

+

x

88

=

x

So the grade she can make on the second test to get at least a  

B

would have to be a  

88

%

.

Answer 2

Answer- 88

Grade on her first test = 72

Let grade on her second test = X

For average to be at least 80

(72+X)/2 =80

72+X = 160

X = 160-72

X= 88

So he should get at least 88 marks in second test.