Ratio
A ratio was the relationship between a factor and a number.

According to a Vissian engineer, Cogenitors made up 3% of the Vissian population, which he deemed to be a perfect ratio. ()

In 2269, Spock noted that the Phylosians used nearly 70% of their brains, a ratio he deemed to be very high. ()

The ratio of matter to antimatter was 1 to 1. This answer was part of a trick question on a Starfleet Academy hyperspace physics test in 2364. ()

Notable ratios
 AFR ratio
 Data compression ratio
 Differential ratio
 Hit to miss ratio
 Intermix ratio
 Osmotic pressure ratio
 Oxygen ratio / oxygen isotope ratio
 Power ratio
 Return force ratio

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Mathematics