The3:1 is the classic mechanical advantage system used by rescuers. It requires less rope than a (non-piggybacked) 2:1 system, is reasonably easy to rig, is easy to add a progress capture device , provides an appropriate amount of mechanical advantage to raise one or two people, and with a few tweaks it can be converted into a simple 5:1 system .
Thismeans that we can also express the ratio of men to women in the group as being . 3 : 4, or "3 to 4 ". This points out something important about ratios: the numbers used in the ratio might not be the absolute measured values. The ratio "15 to 20" refers to the absolute numbers of men and women, respectively, in the group of thirty-five people.
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9 to 3 to 3 to 1 ratio