Question 550047
If John Gets 90% Of Total Marks
 And Ken Gets 90% Of Marks Obtained By John,
 Ken gets 405 marks, What Are The Total Marks 
:
Let x = the total marks
then
.9x = John's marks
and
.9(.9x) = .81x =  Ken's marks
:
.81x = 405
x = 405/.81
x = 500 is the total marks