Question

How do you write 15 more than half a number

Answer 1

half of the number is (1/2 N) 15 more than that is 1/2 N + 15
1/2 N + 15 =9
subtract 15 form each side: 1/2 N = -6
multiply each side by 2: N = -12

Answer 2

Let the unknown number be x.

15 more than half a number is: 
15 > 1/2x

The final answer is 15 > 1/2x (in which x is an unknown number)~