The average of 15 result is 60. Average of the first 10 of them is 10 and that of the last 10 is 80. Find the 8th result? Pick one: A) 35 B) 200 C) 150 D) 250 E) 300
Sum of all the 13 results = 15 * 60= 
<gadget id="calculator">15 * 60</gadget>
<output>900</output>
900   Sum of the first 7 of them= 10 * 10= 
<gadget id="calculator">10 * 10</gadget>
<output>100</output>
100   Sum of the last 7 of them= 10 * 80= 
<gadget id="calculator">10 * 80</gadget>
<output>800</output>
800   So, the 8th number= 900 + 100 - 800= 
<gadget id="calculator">900 + 100 - 800</gadget>
<output>200</output>
200.   200
<result>B</result>
The average of 15 result is 60. Average of the first 10 of them is 10 and that of the last 10 is 80. Find the 8th result?