SOLUTION: A man is 45 years old. 12 years ago, he was three times as old as his daughter. How old is the daughter now?

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Question 1028740: A man is 45 years old. 12 years ago, he was three times as old as his daughter. How old is the daughter now?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +f+ = father's age now
Let +d+ = daughter's age now
-----------------
+f+=+45+
+f+-+12+=+3%2A%28+d+-+12+%29+
+45+-+12+=+3d+-+36+
+33+=+3d+-+36+
+11+=+d+-+12+
+d+=+23+
The daughter is 23 now
---------------------
check:
12 yrs ago, the father was +45+-+12+=+33+
12 yrs ago the daughter was +23+-+12+=+11+
33 is 3 times 11
OK
Also note that the difference in their ages
never changes:
+45+-+23+=+22+
and
+33+-+11+=+22+