<PRE><B>Question 1108985</B>
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Christian is x years old now
A) how old was he 7 years ago?
B) how old will he be in 17 years for now
C) if his age in 15 year ago, how old is he now
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(C)


&quot;if his age in 15 years ago,..&quot;
What? 
 At that time, his age was  {{{x-15}}}.

His age now is still, {{{x}}}.</PRE>