The average marks of Riya,Siya,Lisa was 80. The average marks of Siya,Lisa,Hena was 85. If marks of Hena be 84, what was the mark of Riya?	Choose one
A) 39	B) 69	C) 37	D) 42	E) None of these
Explanation:   R+S+L=80*3= 
<gadget id="calculator">80*3</gadget>
<output>240</output>
240   S+L+H=85*3= 
<gadget id="calculator">85*3</gadget>
<output>255</output>
255   Also, marks of Hena=84   marks of Riya = 240+84-255= 
<gadget id="calculator">240+84-255</gadget>
<output>69</output>
69   Answer: Option 69
<result>B</result>
The average marks of Riya,Siya,Lisa was 80. The average marks of Siya,Lisa,Hena was 85. If marks of Hena be 84, what was the mark of Riya?