exam
Maths Puzzle
Numerical Ability
Mix a solution that is 70% acid with a solution that is 90% water to make 9L of a solution that is 30% acid. How much of each solution should you use?
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exam Other Question
6x^2y^3+9x^2y^3 over 3x^2y^2=
solve the equation by making an appropriate substitution:
(x)2/3 minus (x)1/3 minus 6 = 0