Question

Blanca scored 88%, 82%, and 56% on the last 3 math tests. What score should Blanca receive on her fourth test to keep her average test score to be at least 80%?

A) 74%
B) 82%
C) 90%
D) 96%

Answer 1

To keep her average test score at least 80%, Blanca should receive a score of 94% on her fourth test.

Step-by-step explanation:

To find the score Blanca should receive on her fourth test to keep her average test score at least 80%, we can use the formula:

Average = ((score1 + score2 + score3 + score4) / 4) * 100

Since Blanca's average should be at least 80%, we can set up the equation:

80 = ((88 + 82 + 56 + score4) / 4) * 100

Multiply both sides of the equation by 4/100 to isolate score4:

320 = 88 + 82 + 56 + score4

Combine like terms:

320 = 226 + score4

Subtract 226 from both sides of the equation:

score4 = 320 - 226

score4 = 94

Therefore, Blanca should receive a score of 94% on her fourth test to keep her average test score at least 80%.