Initial liters X, 9 liters are extracted, there are (X-9) liters, quantity of milk there, (X-9) (9/100).

That amount of milk does not change, if the total volume changes, it increases by 9 liters, so we have a solution of X liters to 6% of milk.

Then the amount of milk has not increased or decreased is the same.

So we have to,

(X-9) (9/100) = X (6/100)

X (9/100) - 9 (9/100) = X (6/100)

X (9/100 -6/100) = 9 (9/100)

X (3/100) = 81/100

X = 27 LTS

Answer A

http://www.gmatchile.cl
_________________

claudio hurtado maturana

Private lessons GMAT QUANT GRE QUANT SAT QUANT

Classes group of 4 students GMAT QUANT GRE QUANT SAT QUANT

Distance learning courses GMAT QUANT GRE QUANT SAT QUANT

Website

http://www.gmatchile.clEmail clasesgmatchile@gmail.com

Skype: clasesgmatchile@gmail.com

Address Avenida Hernando de Aguirre 128 Of 904, Tobalaba Metro Station, Santiago Chile.