20, 40, 60 are all common multiples.
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20.20The LCM of 4 and 5 is 20.
The least common multiple of 4 , 5 , 3 , 7 = 420
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.
A number that is divisible by 2, 3, 4, 5, and 10 must be divisible by the least common multiple of these numbers, which is 60. Therefore, any number that is a multiple of 60 will be divisible by 2, 3, 4, 5, and 10. This is because 60 is the smallest number that contains all the prime factors of 2, 3, 4, 5, and 10.
It must be 10.