Question

15-12 ÷3=n what is the value of n?

Answer 1

N = 11 
Use the method PEMDAS. 
P=PARENTHESIS
E=EXPONENT
M=MULTIPLY
D=DIVIDE
A=ADD
S=SUBTRACT
Division is first so you divide. 12 divided by 3 = 4.
Subtraction comes next. 15 - 4 = 11
Hope this helps. 
n=11

Answer 2

11 is the answer to that question