When M equals 25, then M divided by 5 is 5. It makes no difference what N is.
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There are 100 cm per metre, so 5 23/100 metres = 5.23 metres
9 m x 2.5 m = 22.5 m2.
lower case "m" means "milli" = one thousandth5 mA = five milli Amperes = 0,005 A