exam Maths Puzzle Numerical Ability

solve 2/5x -6=12

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exam Other Question

What quantity of 60% acid solution must be mixed with 30% solution to produce 300mL of a 50% solution? i need to find the Foci of 25x2+16y2+150x=160y-225
the 2 that is next to 25x and 16y is supposed to be squared but i didn't no how to do it. thanks for you help.