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Problem:
Teresa's scores on three qúízzes were 78, 81 and 93. What must be her lowest score on the next quiz in order to have an average of at least 85?
Solution:
✓You are tasked to identify the lowest score in the next quiz to get at least 85 for the average. This means that you can only equate the expression with 85 to get the correct answer.
The mathematical inequality for the problem,
✓You need to equate 85 from the quantity of the sum of four qúízzes including the unknown divided by 4.
✓Proceed to cross multiplication after you got the sum of the four qúízzes.
✓Then proceed to simplifying.
To Check:
✓Therefore, the answer is 88 and the statement is correct.
Answer:
✓Eighty-eight must be her score in the fourth quiz to have an average of at least 85.