SOLUTION: The ratio of present ages of two brothers is 1 : 2 and 5 years back, the ratio was 1 : 3. What will be the ratio of their ages after 5 years?

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Question 1113402: The ratio of present ages of two brothers is 1 : 2 and 5 years back, the ratio was 1 : 3. What will be the ratio of their ages after 5 years?

Found 3 solutions by josgarithmetic, ikleyn, amalm06:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
Their present ages may be x and 2x.

Five years ago, for 1:3,

-

-----the younger brother now.

Ratio of ages in 5 more years




*************WRONG BELOW*****************
Their PRESENT ages are 2 and 4.
--
In five more years, ratio:
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.
 = 


3*(x-5) = 2x - 5


3x - 15 = 2x - 5


x = 10.


Answer.  Their present ages are  10 years and 20 years.

Be aware:   the solution by @josgarithmetic and his answer  (2 and 4 years) are obviously   W R O N G

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Answer by amalm06(224)   (Show Source): You can put this solution on YOUR website!
x=2y

(x-5)=3(y-5)

x-5=3y-15

2y-5=3y-15

y=10, x=20 (Present ages)

After 5 years: 15/25=3/5 (Answer)
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