Scott's average (arithmetic mean) golf score on his first four rounds was 78.What score does he need on his fifth round to drop his average score by 2 points?  Choose one:
A) 68  B) 72  C) 78  D) 88  E) 312
68verage score for first 4 rounds = 78   68verage score after 5 rounds = 76   Score Scott needs on his 5th round to drop average score by 2 points = 78 - (2*5)= 
<gadget id="calculator">78 - (2*5)</gadget>
<output>68</output>
68   68nswer 68   68lternatively , sum of scores of first 4 rounds= 78*4= 
<gadget id="calculator">78*4</gadget>
<output>312</output>
312   Sum of scores after 5 rounds= 76*5= 
<gadget id="calculator">76*5</gadget>
<output>380</output>
380   Score Scott needs on his 5th round to drop average score by 2 points= 380 - 312= 
<gadget id="calculator">380 - 312</gadget>
<output>68</output>
68   68nswer 68
<result>A</result>
Scott's average (arithmetic mean) golf score on his first four rounds was 78.What score does he need on his fifth round to drop his average score by 2 points?