exam
Maths Puzzle
Numerical Ability
how many gallons of a 5% acid solution should be mixed with 30 gallons of a 10% acid solution to obtain a mixture that is 8% acid?
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exam Other Question
A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?
I do not have the ISBN number - the book is Beginning Algebra (6th ed.) chapter 10.
Solve the system by addition.
x + y = 4
x - y = 10