If 4/(1 + 3/x) = 1, then x =  Choose the correct answer: A) 3 B) 1 C) 1/3 D) -1/3 E) -3
The expression 4/(1 + 3/x) = 1 should have been equal to something .   If 4/(1 + 3/x) = 1   =&gt; 4x/(x+3)=1   =&gt; 4x=x+3= 
<gadget id="calculator">+3</gadget>
<output>3</output>
&gt;3x= 3   =&gt;x = 1   Correct Option: 1
<result>B</result>
If 4/(1 + 3/x) = 1, then x =