In Mike's opinion, his weight is greater than 65kg but leas than 72 kg. His brother does not agree with Mike and he thinks that Mike's weight is greater than 60kg but less than 70kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Mike?  Choose one:
A) 45.5 kg  B) 50.5 kg  C) 55.5 kg  D) 66.5 kg  E) 72.5 kg
Let Mike's weight be X kg.   According to Mike, 65 &lt; X &lt; 72.   According to Mike's brother, 60 &lt; X &lt; 70.   According to Mike's mother, X &lt; 68.   The values satisfying all the above conditions are 66 and 67.   Required average = (66 + 67) / 2= 
<gadget id="calculator">(66 + 67) / 2</gadget>
<output>133/2 = around 66.5</output>
66.5 kg   66.5 kg
<result>D</result>
In Mike's opinion, his weight is greater than 65kg but leas than 72 kg. His brother does not agree with Mike and he thinks that Mike's weight is greater than 60kg but less than 70kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Mike?