SOLUTION: Ms. Butler is filling planter boxes with soil. She has soil that is 28% sand, and she buys 6 pounds of a commercial potting soil that is 33% sand. She mixes some of her soil with

Question 400613: Ms. Butler is filling planter boxes with soil. She has soil that is 28% sand, and she buys 6 pounds of a commercial potting soil that is 33% sand. She mixes some of her soil with the 6 pounds of commercial potting soil. The resulting soil mixture is 31% sand. How many pounds of her soil did Ms. Butler use?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
In words:
(sand in final mixture)/(sand + soil in final mixture) = 31%
Let = pounds of her soil she used
given:
= pounds of sand in her soil
pounds of sand in commercial potting soil
--------------------------

She needs 4 pounds of her soil
check:

OK
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