Question 982904
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I changed the numbers in your problem:
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Uzma is 16 year old.  Asma is one-fourth older then Uzma. 
How many years ago has it been since Asma was three times as old 
as Uzma?
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Uzma is 16 year old.  
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U = 16
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Asma is one-fourth older then Uzma. 
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A = U + {{{1/4}}}U

Substitute U=16

A = 16 + {{{1/4}}}(16)
A = 16 + 4
A = 20
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How many years ago has it been since Asma was three times as old 
as Uzma?
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Let number of years ago  = y

Azma was A-y and Uzma was U-y

A - y = 3(U-y)

Substitute A=20, U=16

20 - y = 3(16-y)
20 - y = 48 - 3y
    2y = 28
     y = 14

Checking:  14 years ago Uzma was 2 and Azma was 6.
6 is three times 2.

Now you can do your problem.

Edwin</pre></b>