<human>:  Wendy is five times as old as Colin will be seven years from now. In 25 years, Colin will be a third as old as Wendy is now. How old is Colin now?
<bot>: Define a variable ** Let x be Colin's age now.
Write an equation ** (x+7)*5=(x+25)*3
Simplify ** 5*x+35=3*x+75
Simplify ** 2*x=40
Simplify ** x=<<20=20>>20
#### 20