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The positive whole-number factors of 42 are: 1, 2, 3, 6, 7, 14, 21, and 42.
Their lowest common multiple is 378
The number of times 20 goes into 42 can be calculated by dividing 42 by 20. The quotient of this division is 2, with a remainder of 2. Therefore, 20 goes into 42 two times, with a remainder of 2.
No, 8 cannot go into 42 evenly.
Yes. 6 goes into 42 exactly 7 times.