This Christmas,your brother Jack will be 2 years from being twice as old as your sister Jen.The sum of Jack's age and three times Jen's age is 66.How old is Jen?

Answer 1

Let x be Jack's age.
Let y be Jen's age.

x = 2y - 2
x + 3y = 66

So:

2y - 2 + 3y = 66
5y - 2 = 66
5y = 68
y = 13.6.
So she's about 13 and a half years old.