<PRE><B>Question 894275</B>
Hina&#39;s grandfather is quite a bit older than her grandmother. 
In fact,the difference between the squares of their ages is exactly 1988.
how old are they?
:
f^2 - m^2 = 1988
f^2 = m^2 + 1988
{{{f = sqrt(m^2+1988)}}}
only one reasonable integer solution
f = 78, m = 64
:
:
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