80% of Ram's marks is equal to 20% of Rahim's marks which percent is equal to 30% of Robert's marks. If Robert's marks is 80, then find the average marks of Ram and Rahim?	Select the correct option.
A) 70
B) 97
C) 87
D) 90
E) 75
Given, 80% of Ram's marks = 20% of Rahim's marks = 30% of Robert's marks.   Given, marks of Robert = 80   30% of 80 = 30/100 * 8 = 24   Given, 80% of Ram's marks = 24.   =&gt; Ram's marks = (24 * 100)/80= 
<gadget id="calculator">(24 * 100)/80</gadget>
<output>30</output>
30   Also, 20% of Rahim's marks= 24   =&gt; Rahim's marks = (24 * 100)/20= 
<gadget id="calculator">(24 * 100)/20</gadget>
<output>120</output>
120   Average marks of Ram and Rahim= (30 + 120)/2= 
<gadget id="calculator">(30 + 120)/2</gadget>
<output>75</output>
75.   Answer:75
<result>E</result>
80% of Ram's marks is equal to 20% of Rahim's marks which percent is equal to 30% of Robert's marks. If Robert's marks is 80, then find the average marks of Ram and Rahim?