Jon had an average score of 85 on his first five quizzes. He had an
average score of 83 on his first six quizzes. What score did he receive on
his sixth quiz?  Choose the correct option.
A) 55	B) 69	C) 75	D) 73	E) 80
The sum of Jon's first five scores is 5 Â· 85 and the sum of his first six scores is 6 Â· 83, so he received   6 Â· 83 âˆ’ 5 Â· 85 on his 6th quiz. You can do the arithmetic or note that the answer ends in a 3. The correct answer is 73.
<result>D</result>
Jon had an average score of 85 on his first five quizzes. He had an
average score of 83 on his first six quizzes. What score did he receive on
his sixth quiz?