book Maths Puzzle Numerical Ability

12/x - 7 = -27/x + 6

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book Other Question

solve the system graphically: y = 2x - 3
y = 3x - 5

If two linear equations graph as intersecting lines, they are called { } equations. A solution of 60 ml is 50% acid. How many milliliters of water must be added to dilute it to a 30% acid solution?