Concept
Are the numbers 18 and 25 congruent modulo 7?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"the numbers 18 and 25 con- gruent mod 7? Yes. If we take groups of 7 out of 18 stones, we’ll get two such groups (a total of 14 stones) and have 4 left over. And then, if we do that same with 25 stones, we’ll get three such groups (a total of 21 stones) and again have 4 left over. So they’re not congruent mod 7."
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