SOLUTION: Mark is 20 years older than his sister michelle. In 4 years he will be
Twice as old as michelle. How old is each of them now.
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Twice as old as michelle. How old is each of them now.
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Question 720854: Mark is 20 years older than his sister michelle. In 4 years he will be
Twice as old as michelle. How old is each of them now. Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! The difference in their ages does not change
Let = Mark's age now
Let = Michelle's age now
In 4 years:
By substitution,
and, since
Mark's age now is 36
Michelle's age now is 16
check:
in 4 years, they will be 40 and 20
Mark is twice as old
OK
