SOLUTION: Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

Question 72517: Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Let r=ricardo's age, s=sister's age
Here's their age relationship
Sum of their ages
Solve for s
Plug in s=20-r
solve for r

So ricardo is 12 and his sister is:

Check:

Works
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