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how many pairs of whole numbers have a sum of 40

Sagot :

For the writer, 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

10.   10 + 30 = 40
11.  
11 + 29 = 40

12.  
12 + 28 = 40

13.   13 + 27 = 40
14.  
14 + 26 = 40

15.  
15 + 25 = 40

16.  
16 + 24 = 40

17.  
17 + 23 = 40

18.  
18 + 22 = 40

19.  
19 + 21 = 40

20.  
20 + 20 = 40