The average of 7 results is 45. The average of first three results is 47 and average of last three results is 42. What is the fourth result? Choose the correct choice from the following
A) 48  B) 47  C) 44  D) 46  E) 49
Explanation:   Total of results = 45 * 7= 
<gadget id="calculator">45 * 7</gadget>
<output>315</output>
315   Total of first three results= 3* 47= 
<gadget id="calculator">3* 47</gadget>
<output>141</output>
141   Total of last three results= 3* 42= 
<gadget id="calculator">3* 42</gadget>
<output>126</output>
126   Fourth result= 315 - (141 + 126)= 
<gadget id="calculator">315 - (141 + 126)</gadget>
<output>48</output>
48   48nswer: Option 48
<result>A</result>
The average of 7 results is 45. The average of first three results is 47 and average of last three results is 42. What is the fourth result?