SOLUTION: Jenifer is 20 years old and her sister is 4 years old. In how many years will Jenifer be four times as old as her sister?

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Question 649341: Jenifer is 20 years old and her sister is 4 years old. In how many years will Jenifer be four times as old as her sister?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Add +x+ years to both their ages
given:
+20+%2B+x+=+4%2A%28+4+%2B+x+%29+
+20+%2B+x+=+16+%2B+4x+
+3x+=+4+
+x+=+4%2F3+
+x+=+1+%2B+1%2F3+
( note that 1/3 year = 4 months )
In 1 year and 4 months Jennifer will
be 2x as old as her sister
check:
J will be +20+%2B+4%2F3+=+21+%2B+1%2F3+
Sis will be +4+%2B+4%2F3+=+5+%2B+1%2F3+
+4%2A%28+5+%2B+1%2F3+%29+=+20+%2B+4%2F3+
+20+%2B+4%2F3+=+21+%2B+1%2F3+
OK