
Concept explainers
Find the minimum number Marta need to score on her 4th test to have of 85 or better for all 4 tests.

Answer to Problem 60PFA
Option C is correct.
Explanation of Solution
Given:
Marta scores 85, 70 and 92 on three math tests. What does she need to score on her fourth math test to have an average of 85 or better for all four tests?
There are 4 options:
A: 85 or better; B: better than 93; C: 93 or better; D: 100
Concept Used:
Let Marta score on her 4th test be x .
Marta scores 85, 70 and 92 on three math tests.
Total score for her in 4 tests =
According to the condition: An average of 85 or better for all four tests.
85 or better means with the sign
Average marks =
Inequality:
Calculation:
Total score for her in 4 tests =
Average marks =
Inequality:
Solve for x :
Marta should score 93 or better in the 4th test.
C: 93 or better is correct.
Thus, Marta should score 93 or better in the 4th test. Option C is correct.
Chapter 5 Solutions
Algebra 1, Homework Practice Workbook (MERRILL ALGEBRA 1)
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