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Mr. Tanaka is 35 years old, and his son is 5. In how many years will Mr. Tanaka be three times as old as his son?

 May 26, 2014

Best Answer 

 #1
avatar+26397 
+7

Mr. Tanaka = T

Son = S

years = y

T+y=(S+y)3T+y=3S+3y|3ST+y3S=3y|yT3S=2y|:2y=T3S2y=35352y=35152y=202y=10

In 10 years: Mr Tanaka is 45 and his son is 15.

15 * 3 = 45

 May 26, 2014
 #1
avatar+26397 
+7
Best Answer

Mr. Tanaka = T

Son = S

years = y

T+y=(S+y)3T+y=3S+3y|3ST+y3S=3y|yT3S=2y|:2y=T3S2y=35352y=35152y=202y=10

In 10 years: Mr Tanaka is 45 and his son is 15.

15 * 3 = 45

heureka May 26, 2014

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