Question 1169224
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Five years ago, Sam was seven times as old as his nephew, Bert. Now, Sam is only four times as old as Bert. 
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x, Sam
b, Bert

{{{system(x-5=7(b-5),x=4b)}}}
.
.
{{{system(highlight(b=10),and,highlight(x=40))}}}




?
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How old is Sam now if the sum of their ages now is 50?
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Not necessary.


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