work. Do not solve.
-5x + 9y = -12
-4x - 4y = -32
A) Substitution B) Addition
Answer: B
Write the word or phrase that best completes each statement or answers the question.
-A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should he mix with 8 bags of 16% cement to produce a mix containing 12% cement?
A) 8 bags
B) 10 bags
C) 16 bags
D) 21 bags

Question

Quizplus · Accepted Answer

The problem can be solved using the method of weighted averages to find the correct number of 8% cement bags needed to achieve a 12% cement mix when combined with 8 bags of 16% cement.

Work. Do Not Solve