SOLUTION: Joe is 5 years older than Sally. In 15 years Joe will be 3 times as old as Sally is now. How old is Sally now? Hint: Write Joe's age now in terms of Sally's age now. Then write Joe

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Question 397584: Joe is 5 years older than Sally. In 15 years Joe will be 3 times as old as Sally is now. How old is Sally now? Hint: Write Joe's age now in terms of Sally's age now. Then write Joe's age in 15 years using the expression you just wrote for Joe's age now. Then using S for Sally's age now, write the equation in only one variable "S" and solve it
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, 

Joe is 5 years older than Sally

Let x and (x + 5) represent Sally's and Joe's ages NOW  respectively

Question states*** in 15 years...

   (x + 5)  + 15 = 3x

Solving for x

       20 = 2x

       x = 10, Sally's age NOW. Joe age NOW is 15.  (10+5) 



CHECKING our Answer***

15 + 15 = 3*10