book Maths Puzzle Numerical Ability

how do i work out 3% solution from a 6% solution of 1.5ml hydrogen peroxide solution?

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3x+6y=14
x+2y=3 solve the quadratic equation: 9d^2-81=0
what is the slope of the x-axis?
what is the slope and y-intercept for the line: -10x-5y+20=0
what is the slope of the line y=1/2x?
what