The weight of four dogs is determined to be 25 pounds, 31 pounds, 35 pounds and 33 pounds respectively. The weight of a fifth dog is determined to be y pounds. If the average (arithmetic mean) weight of the first four dogs is the same as that of all five dogs what is the value of y?  Select:
A) 31 B) 33 C) 35 D) 37 E) 39
Total weight of the 4 dogs = (25+31+35+33)= 
<gadget id="calculator">(25+31+35+33)</gadget>
<output>124</output>
124   Avg= 124/4= 
<gadget id="calculator">124/4</gadget>
<output>31</output>
31   Total weight of 5 dogs= 124+y or 4(31)+y   Average of 5 dogs as per Question = 31   Equation:   4(31) + y = 5 (31), or y = 31.   Choose 31
<result>A</result>
The weight of four dogs is determined to be 25 pounds, 31 pounds, 35 pounds and 33 pounds respectively. The weight of a fifth dog is determined to be y pounds. If the average (arithmetic mean) weight of the first four dogs is the same as that of all five dogs what is the value of y?