SOLUTION: a man is twice as old as his duaghter ten years ago he was three times as old. How old is the daughter?

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Question 1037138: a man is twice as old as his duaghter ten years ago he was three times as old. How old is the daughter?
Found 4 solutions by ikleyn, josmiceli, MathTherapy, Vixiachase:
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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a man is twice as old as his duaghter ten years ago he was three times as old. How old is the daughter?
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Why do you miss the separator "dot", "." from time to time?

Is it a special style?

Why I should decipher your post?


Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +a+ = man's age now
Let +b+ = daughter's age now
------------------------------
(1) +a+=+2b+
(2) +a+-+10+=+3%2A%28+b+-+10+%29+
-------------------------
Substitute (1) into (2)
(2) +2b+-+10+=+3%2A%28+b+-+10+%29+
(2) +2b+-+10+=+3b+-+30+
(2) +b+=+20+
The daughter is 20
-----------------
check:
(1) +a+=+2b+
(1) +a+=+2%2A20+
(1) +a+=+40+
and
(2) +a+-+10+=+3%2A%28+b+-+10+%29+
(2) +a+-+10+=+3%2A%28+20+-+10+%29+
(2) +a+-+10+=+30+
(2) +a+=+40+
OK

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

a man is twice as old as his duaghter ten years ago he was three times as old. How old is the daughter?
Daughter is highlight_green%28matrix%281%2C2%2C+20%2C+years-old%29%29 


Answer by Vixiachase(22) About Me  (Show Source):