280
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The least common multiple of 5 , 8 , 15 = 120
LCM(5, 6, 8, 10) = 120.
The LCM is 840.
5 is prime 8 is 2 to the third and 16 is 2 to the fourth. LCM is therefore 5 x 2 to the fourth ie 80.
LCM of 8, 5 and 12 is 120...