SOLUTION: how many liters of 40% solution has to be added to 10 leiters of 80% to make 60%? I need linier equations with 2 viariables to solve

Question 297117: how many liters of 40% solution has to be added to 10 leiters of 80% to make 60%?
I need linier equations with 2 viariables to solve
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of 40% solution needed
Let = liters of 60% solution you end up with
given:
(1)
(2)
-------------------------------------
from (2),
(2)

-----------------------

and
answers
--------------------------
check answers:

and, since

(2)
(2)

OK

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