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Q: What is a factor of 40 and can add up to -30?

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The only number between 30 and 40 with distinct prime factors which add up to 12 is 35.

41

The four factors of 33 add up to 48.

Its factors are: 1, 3, 9, 27 and they add up to 40

The four factors of 33 add up to 48.

The factor pairs of 30 are (30,1)(15,2)(10,3)(6,5) None of them add up to 20.

20

Add them up. 30 32 33 34 35 36 38 39 40

30

The factor pairs of 4 are (4,1) and (2,2) Neither of them add up to 40.

33 has four factors that add up to 48.

It wasn't me, but I would have come up with 33. The four factors of 33 add up to 48.

40

70

35 is a composite number between 30 and 40 whose primev factors (5 and 7) have a sum of 12.

-41

481

How about: 17+23 = 40 as one example

factors of 30 that add to 17 are 2 and 15

340

They are 40 and 40

They are: 3+37 = 40

They are: 29+11 = 40

The factor pairs of -40 are (-40,1)(-20,2)(-10,4)(-8,5)(40,-1)(20,-2)(10,-4)(8,-5) None of them add up to 8.

It is impossible for three prime numbers less than 30 to add up to 1955. After all, 30+30+30 is only 90.