The average of 17 numbers is 59. Average of the first 9 of them is 56 and that of the last 9 is 63. Find the 9th number? Pick one
A) 64	B) 68	C) 65	D) 66	E) 67
Sum of all the 17 numbers = 17 * 59 = 1,003
Sum of the first 9 of them = 9 * 56= 
<gadget id="calculator">9 * 56</gadget>
<output>504</output>
504
Sum of the last 9 of them= 9 * 63= 
<gadget id="calculator">9 * 63</gadget>
<output>567</output>
567
So, the 8th number= 504 + 567 - 1,003
= 68.
Answer: 68
<result>B</result>
The average of 17 numbers is 59. Average of the first 9 of them is 56 and that of the last 9 is 63. Find the 9th number?