A and B form a study group and divide a 75 question study guide. If A answer 7 questions per hour, while B answer 5 every hour, what fraction of the study guide is incomplete after 4 hours?
Choose one:
A) 48/75  B) 20/75  C) 27/75  D) 28/75  E) 16/75
Number of questions A can answer per hour: 7   Number of questions B can answer per hour: 5   Number of questions A and B can answer per hour:  7+5= 
<gadget id="calculator"> 7+5</gadget>
<output>12</output>
12   Number of questions A and B can answer in 4 hours: 4x12=48   Fraction of the study guide that is incomplete = 1-48/75=27/75   Answer is 27/75
<result>C</result>
A and B form a study group and divide a 75 question study guide. If A answer 7 questions per hour, while B answer 5 every hour, what fraction of the study guide is incomplete after 4 hours?