SOLUTION: Ali's father was five times as old as Ali 7 1/2 years ago. After 7 1/2 years father will be twice as old as Ali. What are their present ages.

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Question 1107151: Ali's father was five times as old as Ali 7 1/2 years ago. After 7 1/2 years father will be twice as old as Ali. What are their present ages.
Found 3 solutions by ikleyn, josgarithmetic, Alan3354:
Answer by ikleyn(52797) About Me  (Show Source):
You can put this solution on YOUR website!
.
There is a common view to (and common understanding of) the age problems:  They always must go with integer  numbers: the input 
consists of integer numbers, AND the output, the resulting answer MUST be integer number.


All other formulations to age problems, even although they use the terms "age", "year" and so on, are commonly considered as DEFECTIVE.

And are redirected to the TRASH section.



Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
If you follow the problem description literally with f for Father and a for Ali present ages, and simplify the resulting system of equations, you can form system%28f-5a=-30%2Cf-2a=7%261%2F2%29 .

You should find a=12%261%2F2 and f=20 .

(values seem a little strange)

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If fractions of years are used in age problems, then we have to know the birthdays.