SOLUTION: How do you solve this equation 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
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Question 261437: How do you solve this equation 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.
You can put this solution on YOUR website! Let the age of Sally = x
Then the age of Joe = x+5
Also, in 15 years Joe will be 3 times as old as Sally is now.
x+5+15 = 3x
x+20 = 3x
20 = 3x-x
20 = 2x
2x = 20
x = 20/2
x = 10 years
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