SOLUTION: Jen is 80 years old and her grandson mark is 5 years old, in how many years will Jen be 4 times Mark's age ?

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Question 989680: Jen is 80 years old and her grandson mark is 5 years old, in how many years will Jen be 4 times Mark's age ?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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J=Jen's age=80 years; M=Mark's age=5 years;
x=years until Jen is 4 times Mark's age
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J+x=4(M+x)
80+x=4(5+x)
80+x=20+4x
60=3x
20=x
ANSWER: Jen will be 4 times Mark's age in 20 years.
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CHECK:
J+x=4(M+x)
80+20=4(5+20)
100=4(25)
100=100