After M students took a test, the average score was 65%. If the test has 50 questions, what is the least number of questions that the next student has to get right to bring the average score up to 70%?	Choose the correct choice from the following
A) 2.5M + 35 B) M + 37.5 C) 0.65M + 70 D) 70 - 0.65M E) 35+0.65M
The total number of correct answers for M students is (0.65)*50*M=32.5*M   For an average of 70%: (total correct answers) / (M+1) = 0.7*50= 
<gadget id="calculator">0.7*50</gadget>
<output>35</output>
35   Let x be the number of correct answers for the next student.   (x + 32.5M) / M+1= 35   x + 32.5M= 35M+35   x = 2.5M + 35   The answer is 2.5M + 35.
<result>A</result>
After M students took a test, the average score was 65%. If the test has 50 questions, what is the least number of questions that the next student has to get right to bring the average score up to 70%?