The ratio of 31 to 13 can be expressed as 31:13. To simplify, you can divide both numbers by their greatest common divisor, which is 1 in this case, so the ratio remains 31:13. This indicates that for every 31 units of one quantity, there are 13 units of another.
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31 - 13 = 18
13:21
As a ratio it would be 20:1
The ratio of 30 days in a month to 31 days in a month can be expressed as 30:31. This ratio cannot be simplified further as 30 and 31 are both prime numbers and have no common factors other than 1. This means that for every 30-day month, there is an additional 1 day in a 31-day month, making the ratio slightly less than 1:1.
The GCF is 1.