Question 255270
Pat and Chris have the same birthday. 
Let p = Pat's present age
and
Let c = Chris's present age
:
Write an equation for the statement"
:
Pat is twice as old as Chris was when Pat was as old as Chris is now
:
p = 2(p - (p - c))
p = 2(p - p + c)
p = 2c
"Pat is 24 yrs old"
Replace p with 24
2c = 24
c = 12 yrs is Chris's age now