Posted by Dom on .
Sara is 24 years younger than Joe. Six years ago she was half as old as he was. How old is he now?

Prealgebra 
Reiny,
present age:
Joe  x
Sara  x24
Six years ago:
Joe  x6
Sara  x24  6 = x  30
x  30 = (1/2)(x6)
times 2
2x  60 = x  6
x = 54
Joe is now 54 , and Sara is now 30
check:
six years ago , Joe was 48 , and Sara was 24
Was he twice as old as Sara ??? YES