It is 70
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The lowest common multiple of the given numbers is 630
7/10 - 1/5 = 7/10 - 2/10 = 5/10 = 1/2
2/5 + 7/10 = 4/10 + 7/10 = 11/ 10 or... 1 and 1/20
The answer is 168. 168/6=28 168/7=24 168/8=21
2 and 7/10 + 5 and 3/10 = 8