Question

Solve this word problem. Please help!


A cosmetologist has a bottle of 7% hydrogen peroxide solution and a bottle of 4% hydrogen peroxide solution. The cosmetologist needs 300 milliliters of a 5% hydrogen peroxide solution for a hair dye. Write and solve a linear system to find how many milliliters of each solution the cosmetologist needs to mix together.

Answer 1

@zepdrix

Answer 2

Start by choosing variables. Which variable do you want use to represent the volume of the 7% solution? Which var. to repr. the vo. of the 4% solution?

Answer 3

Adding these two different volumes together gives you an expression for the total volume of the new, 5% solution. How would you express this algebraically, using your two letters and the total volume of the 5% solution (it's given)?

Answer 4

I insist that "these ideas" are completely relevant to solving this problem.

What is the goal of the problem? Write it out in your own words, please. Do you see any connection between this goal and the need to identify the volumes of the 2 solutions you begin with?

Answer 5

I'd bet that yours is an Algebra course. Is it?

If so, how is Algebra markedly different from your previous course work?

Answer 6

"milliliter" is one-thousandths of a liter.
The liter is a measure of (what quantity?)

Therefore, the milliliter is also a measure of (what quantity?)

Answer 7

What happened to our previous dialogue? Have you deleted your own comments? If so, why?

Answer 8

http://www.purplemath.com/modules/mixture.htm