What will be the ratio of 7.5 m and 25 mm?
300 : 1
300 : 1 is correct.
Two quantities can be compared as a ratio only when they are in the same unit; then both terms are divided by their common factor to get the simplest form.
Both quantities must be in the same unit. 1 m = 1000 mm, so \(7.5\text{ m}=7.5\times 1000=7500\text{ mm}\).
\(7500:25=\dfrac{7500}{25}:1=300:1\).
Hence, the ratio is 300 : 1.
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