book Maths Puzzle Numerical Ability

Hi there,

I don't get this problem with extraneous solutions at all! Could someone please help me work out this problem before class?
2m / 5 = 3m / 2

Thank you
AC

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book Other Question

For a light that has an intensity of 60 candles at its source, the intensity in candles, S, of the light at a point d feet from the source is given by the formula S=60K/d� , where Solve for L S=2WL+2LH+2WH