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Pola wants 3 oz of a 20% solution. she has only 5% and 30% available. how many oz of each should she mix to get what she wants?

Mathematics
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x+y =3 oz .05*x + .3*y = .2*3
could you please solve the equations..i dont know how to....
and why did u multiply .2 by 3

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Other answers:

what class are you taking?
Algebraic multiplied 0.2 by 3 because thats the amount of substance in 3 oz of solution (0.2 = 20%)
math 130- intermediate algebra
should be no problem for you to solve. very simple substitution.
ok. thnks
when pppl give yu best responses yur smart score goes up huh?
yes.
i multiplied the top equation by -.3 so that i could cancel out the y value and after i solved i got x= -.21
solve for either x or y, your choice: x+y =3 sub.s into: .05*x + .3*y = .2*3

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