Question 1183664
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Bill is 5 times older than Keira, Bill is 5 times older than Phil, Oscar is twice as old as Bill, 
and the total age of all of them at 81. How old is Phil?
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In English,  the forms like this    "Bill is 5 times older than Keira"   are prohibited in  Math problems formulations.



In this part,  English is very different from many other languages. 



            (In this part,  English is  RADICALLY  different from many other languages,

            and the newcomers,  as a rule,  don't know and even don't suspect about it  ( ! ) )



Therefore,  when you translate from your native language,  be careful -- you should know standard English patterns 

for the subject to which you create/translate your problem.