The difference between 5 and 20 is 15.
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20
15 + 5 =20 so its 5
20 and 30 are rectangular numbers (4 * 5 and 5 * 6). There are none in between them.
5.
Depending if the 5 is in the "over 20" or not. Because what you stated is unclear, it can be (5+7)/20 or 5+7/20, which is two different answers, 0.6 and 5.35.