63
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It is 280
105 is the lowest, following this, multiples of 105
28 is the LCM of 4 and 7 , the smallest number divisible by both.
The number that both 7 and 8 can go into evenly is 56.
5 and 7 are both prime number so their LCM is their multiple, viz 5*7 = 35.35