Question 620221
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
Luke is <u>4 years older than his sister's age</u>{{{highlight(x)}}}
  In 10 years the sum of their ages will be 60 years. 
   (x+10) + [(x+4) + 10 = 60
      2x + 24 = 60
         2x = 36
          x = 18, the sister's age.  Luke is 22.  
CHECKING our Answer***
  28 + 32 = 60 

area of a square(with side{{{highlight(s)}}})whose perimeter is represented by 12x.  P = 4s = 12x,  s = 3x
 A = s^2 = (3x)(3x) = 6x^2