Any number except 61 67 71 73 and 79 which are prime numbers
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60 and 80 :D
There is no prime number between 60 and 80 that has a consecutive sum. The prime numbers between 60 and 80 are 61, 67, and 71, but none of them have consecutive sums.
60 is 80% of what number:= 60 / 80= 60 / 0.8= 75
70, 72, 74, 75, 76, 77, 78, 80
60(40+80)/2 = 60