SOLUTION: how many gallons of a plant food tha is 9% nitrogen must be combined with another plant food tha is 25% nitrogen to make 10 gallons of a solution that is 15% nitrogen?
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Question 104488: how many gallons of a plant food tha is 9% nitrogen must be combined with another plant food tha is 25% nitrogen to make 10 gallons of a solution that is 15% nitrogen?
and the second one i am stuck on is:
two cyclists start from the same point and ride in opposite directions. one cyclist rides twice as fast as the other. in 3 hours, they are 81 miles apart. find the rate of each cyclist.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
let x=(gallons of 9%), so 10-x=(gallons of 25%)
x(9%)+(10-x)(25%)=10(15%)
let x=slower, so 2x=faster ... rt=d
x(3)+2x(3)=81
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