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Given that a = x minus 15 / 2, and X is a natural number less than 10, find the value of positive integer a
a> 0, then X-2 > 0
A is an integer, and the number divisible by 15 is 1,3,5,15
When X-2 = 1, x = 3, a = 15
When X-2 = 3, x = 5, a = 5
When X-2 = 5, x = 7, a = 3
When X-2 = 15, x = 17 does not satisfy the condition
The value of a is 3, 5 or 15
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