If (A+B) = 12, (B+C) = 9 and (C+D) = 3, what is the value of (A+D)?  Choose the correct option:	A) 16.	B) 8.	C) 7.	D) 6.	E) -2.
Given A+B = 12 =&gt; A = 12 - B --&gt; Eq 1   B+C = 9   C+D = 3 =&gt; D = 3 - C --&gt; Eq 2   Then Eqs 1 + 2 =&gt; A + D = 12 - B + 3 - C   =&gt; 15 - (B+C)   =&gt; 15 - 9= 
<gadget id="calculator">15 - 9</gadget>
<output>6</output>
6.   Option 6....
<result>D</result>
If (A+B) = 12, (B+C) = 9 and (C+D) = 3, what is the value of (A+D)?