The average weight of a class is x pounds. When a new student weighing 70 pounds joins the class, the average decreases by 1 pound. In a few months the student’s weight increases to 110 pounds and the average weight of the class becomes x + 4 pounds. None of the other students’ weights changed. What is the value of x?  Choose the correct choice from the following options:
A) 26 B) 86 C) 88 D) 90 E) 92
When the student weighs 80 pounds the average weight is x - 1 pounds;   When the student weighs 110 pounds the average weight is x + 4 pounds.   So, the increase in total weight of 110 - 70= 
<gadget id="calculator">110 - 70</gadget>
<output>40</output>
40 pounds corresponds to the increase in average weight of (x + 4) - (x - 1) =5 pounds, which means that there are 40/5 (  + 4) - (  - 1)= 
<gadget id="calculator">(  + 4) - (  - 1)</gadget>
<output>5</output>
5 pounds, which means that there are  40/5= 
<gadget id="calculator"> 40/5</gadget>
<output>8</output>
8 students (including the new one). So, initially there were 5 student.   Total weight= 5x + 70 = 8(x-1) --&gt; x = 26 pounds.   26nswer: 26.
<result>A</result>
The average weight of a class is x pounds. When a new student weighing 70 pounds joins the class, the average decreases by 1 pound. In a few months the student’s weight increases to 110 pounds and the average weight of the class becomes x + 4 pounds. None of the other students’ weights changed. What is the value of x?