How many numbers less than 100 have digits whose sum is 10?
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there are 9 number .
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I think 9 numbers (1-9)
1) 19=(1+9)=10
2) 28=(2+8)=10
3) 37=(3+7)=10
4) 46=(4+6)=10
5) 55=(5+5)=10
6) 64=(6+4)=10
7) 73=(7+3)=10
8) 82=(8+2)=10
9) 91=(9+1)=10
1) 19=(1+9)=10
2) 28=(2+8)=10
3) 37=(3+7)=10
4) 46=(4+6)=10
5) 55=(5+5)=10
6) 64=(6+4)=10
7) 73=(7+3)=10
8) 82=(8+2)=10
9) 91=(9+1)=10
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