Question

The difference between the ages of 2 cousins is 10 years .15 years ago if the elder one was twice as old as the ypunger one,find their present ages

Answer 1

The elder person is "always" 10 years older than the younger person! 
Let E be the age of the elder person fifteen years ago!
(E-10) being the age of the younger person. 
Question states the following to be true fifteen years ago.
E= 2(E-10) 

Solve
E= 2E-20
20=2E
10=E the age of the elder person fifteen years ago! 
Present Ages!
Elder is now 25 and the younger 15!
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