book
Maths Puzzle
Numerical Ability
How many ounces each of a 12% alcohol solution and a 30% alcohol solution must be combined to obtain 60 ounces of an 18% solution?
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book Other Question
Find all 2 x 2 matrices whose nullspace is the line 3x-5y=0
in substitution how do you solve for a equation for x. then solve it for y?
example 3x-5y=12