Solution:
Let the number be 10x+y.
Half of 100 = 50
6 tens = 60
8 tens = 80
According to the question,
10x+y>50
10x+y>60
10x+y<80
∴ The number can be 61,62,63,64,65,66,67, 68,69,70,71,72,73,74, 75,76,77,78,79.
x=2y and x+y=9
Here, only one number satisfies the above condition i.e. 63.
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