The average of 25 result is 18.The average of 1st 12 of them is 14 & that of last 12 is 17.Find the 13th result.
Choose the correct option:
A) 57	B) 48	C) 36	D) 78	E) 52
Clearly 13th result=(sum of 25 results)-(sum of 24 results)   =(18*25)-(14*12)+(17*12)   =450-(168+204)   =450-372= 
<gadget id="calculator">450-372</gadget>
<output>78</output>
78.   Ans: 78
<result>D</result>
The average of 25 result is 18.The average of 1st 12 of them is 14 & that of last 12 is 17.Find the 13th result.