Problema Solution
For an experiment, a student requires 200 milliliters of a solution that is 9 % NaCl (sodium chloride). The storeroom has only solutions that are 10 % NaCl and 5 % NaCl. How many milliliters of each available solution should be mixed to get 200 milliliters of 9 % NaCl?
____ ml of 5 % solution should be used.
_____ ml of 10 % solution should be used.
Answer provided by our tutors
Let
x = ml of 5 % solution
y = ml of 10 % solution
x + y = 200
0.10x + 0.05y = 0.09*200
........
click here to see the system of equations solved for x and y
........
x = 160 ml
y = 40 ml
160 ml of 5 % solution should be used.
40 ml of 10 % solution should be used.