The average of seven results is 156 and that of the first six is 169. The fifth result is? Choose the most appropriate option:
A) 120	B) 160	C) 89	D) 78	E) 148
7 * 156 â€“ 6 * 169 = 78   Answer: 78
<result>D</result>
The average of seven results is 156 and that of the first six is 169. The fifth result is?