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How many pairs of whole numbers numbers have a sum of 40

User Adelina
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1 Answer

6 votes
there are 20
1. 1 + 39 = 40

2.
2 + 38 = 40

3. 3 + 37 = 40
4. 4 + 36 = 40
5.
5 + 35 = 40

6.
6 + 34 = 40

7. 7 + 33 = 40
8. 8 + 32 = 40
9.
9 + 31 = 40

and the list goes on and on
User Anders Swanson
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