Mathematics · Word Problems
A city is planning to build a rock retaining wall. The table below shows characteristics for rock types considered: Rock type Weight per volume (lb/ft 3 ) Cost per pound Basalt 180 $0.18 Granite 165 $0.09 Limestone 120 $0.03 Only basalt, granite, and limestone will be used. The rocks will have a total weight of 1,000 pounds. If 330 pounds of granite is used, which of the following equations shows the relationship between the volumes x and y, in ft 3 , of limestone and basalt used, respectively?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1120x + 180y = 1,000
- 2120x + 180y = 670✓
- 3165x + 120y = 1,000
- 4165x + 180y = 670
Correct answer
120x + 180y = 670
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