SOLUTION: a nurse needs rubbing alcohol, which is a 70% alcohol solution. However, there is only a 40% alcohol solution and a 90% alcohol solution in stock. how much of each solution should
Algebra ->
Customizable Word Problem Solvers
-> Mixtures
-> SOLUTION: a nurse needs rubbing alcohol, which is a 70% alcohol solution. However, there is only a 40% alcohol solution and a 90% alcohol solution in stock. how much of each solution should
Log On
Question 1093599: a nurse needs rubbing alcohol, which is a 70% alcohol solution. However, there is only a 40% alcohol solution and a 90% alcohol solution in stock. how much of each solution should be mixed in order to obtain 8 ounces of the desired solution? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = ounces of 40% solution needed
Let = ounces of 90% solution needed
-------------------------------------------
(1)
(2)
----------------------------
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
-----------------------------------
(2)
(1)
--------------------------
and
(1)
(1)
(1)
-----------------------
3.2 ounces of 40% solutions are needed
4.8 ounces of 90% solution are needed
-------------------------------------
check:
(2)
(2)
(2)
(2)
OK
