John is 3 years elder than Alvin. Write john's age in terms of Alvin's age. Take Alvin's age is ‘p’ years.
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At the beginning, you begin with one whole that's been split into 25 pieces, or 25ths. Before you cover any of them up, you still have all 25, so you have 25 25ths, or, as a fraction, 
. Next, you take away 3 of those 25ths, or 
, which leaves you with 
, or 
.