Find the smallest value of n so that 37 + n, n/5, and sqrt(n + 144) are all natural numbers.
I just looked at it and got 25. All I did was see how much it took to get to the next square after 144 and would that number be evenly divisible by 5. Once you get a number that satisfies the second two conditions, the 37+n is a gimme.
edited to add ~ Zero works too, but I assumed the problem wanted a non-zero solution.