The GCM of any set of numbers is infinite.
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80 is 25% more than 64.
80% of 80 is 64 64 right answers right and 16 wrong answers
There can be no GCM (Greatest Common Multiple). Suppose a GCM exists and suppose it is x. That is, x is the GCM of 7 and 13, then 2x is a multiple of both 7 and 13 and is greater than x. This contradicts the statement that x is the GCM. So x cannot be the GCM.
64+16 = 80
What you do is divide 80, or any number, by 100 then multiply by the percent you need, like 80, and there's your answer. Example (Your problem): 80/100=0.8 0.8x80=64 So your answer: 80% of 80 is 64