420
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The least common multiple of 4 , 5 , 3 , 7 = 420
10 is a multiple of 1, 2 and 5 from the given numbers
4/5 of 7 is 5 3/5
-3
To add 2/5 and 3/10, we need to find a common denominator. The least common multiple of 5 and 10 is 10, so we can rewrite 2/5 as 4/10. Adding 4/10 and 3/10 gives us 7/10. Therefore, 2/5 + 3/10 = 7/10.