The average of seven numbers is 55. If one number is excluded, the average becomes 52. The excluded number is:  Select.
A) 55 B) 57 C) 70 D) 73 E) 74
Explanation :   Excluded number = (55 x 7) (52 x 6) = 385 - 312= 
<gadget id="calculator">385 - 312</gadget>
<output>73</output>
73   Answer : 73
<result>D</result>
The average of seven numbers is 55. If one number is excluded, the average becomes 52. The excluded number is: