<PRE><B>Question 1110355</B>
A father is 43 and he has two kids who are 9 and 11.
 How many years have to go by so that the ages of the two kids equal the age of the father?
:
let y = no. of years for this to be true
43 + y = (y+9) + (y+11)
43 + y = 2y + 20
43 - 20 = 2y - y
23 = y
:
23 yrs for this to be true
:
:
Check this:
43 + 23 = 9 + 23 + 11 + 23 
66 = 32 + 34 </PRE>