A batsman makes a score of 80 runs in the 11th inning and thus increases his average by 5. Find his average after 11th inning.
Choose the most appropriate option:
A) 40 B) 50 C) 62 D) 30 E) 56
Let the average after 11th inning = x   Then, average after 10th inning = x-5   10(x-5)+80 = 11x   x = 80-50= 
<gadget id="calculator">80-50</gadget>
<output>30</output>
30   Answer is 30
<result>D</result>
A batsman makes a score of 80 runs in the 11th inning and thus increases his average by 5. Find his average after 11th inning.