The average of 15 numbers is 75. Average of the first 8 of them is 68 and that of the last 8 is 77. Find the 8th number?	Select
A) 51  B) 87  C) 35  D) 75  E) 68
Sum of all the 15 numbers = 15 * 75 = 1,125
Sum of the first 8 of them = 8 * 68= 
<gadget id="calculator">8 * 68</gadget>
<output>544</output>
544
Sum of the last 8 of them= 8 * 77= 
<gadget id="calculator">8 * 77</gadget>
<output>616</output>
616
So, the 8th number= 544 + 616 - 1,125
= 35.
Answer: 35
<result>C</result>
The average of 15 numbers is 75. Average of the first 8 of them is 68 and that of the last 8 is 77. Find the 8th number?