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Any multiple of 84.
84
Their LCM is 84
It is: 4 and 3/7 as a mixed number
The number is 21. 21 ÷ 3 = 7 7 - 3 = 4
7*4=28 9*3=28 -Reloque
Each number will divide into 420 with no remainder
Just 1
840
It is 7 3/4.
5, 7, and 3 go into 105.
4
It is 4 3/7.