Five years ago, the average age of A, B, C and D was 45 yr. with E joining them now, the average of all the five is 50 yr. How old is E?  Choose one:
A) 50 yr  B) 40 yr  C) 45yr  D) 64 yr  E) NOne
Solution:   Total present age of A, B, C and D,   = (45*4)+(4*5)= 
<gadget id="calculator">(45*4)+(4*5)</gadget>
<output>200</output>
200 yr;   Total age present age of A, B, C, D and E,= 50*5= 
<gadget id="calculator">50*5</gadget>
<output>250</output>
250 yr.   So, age of E= 50 yr.   50 yrnswer: Option 50 yr
<result>A</result>
Five years ago, the average age of A, B, C and D was 45 yr. with E joining them now, the average of all the five is 50 yr. How old is E?