Question 1152848

Natasha is 5 years older than Alex. Fiona is 10 years younger than Alex. If the total of their ages is 55, how old is the youngest of them?
<pre>It should be obvious to anyone who reads this that Fiona is the youngest.
Let Fiona's age be F
Then Alex' is F + 10, and Natasha's is: F + 10 + 5, or F + 15
We then get: F + F + 10 + F + 15 = 55
3F = 30
F, or Fiona, being the youngest is: {{{highlight_green(matrix(1,4, 30/3, "=", 10, years-old))}}}