U hav2 cansL T fracshnz
250/60 = 25/6
so 25/6 = bd/ac
a is 30 or 32 I understand; but by 'bcd can be....(list)' do you mean b x c x d must be one of the list, or that each of b, c, and d must be picked from the list. Can we repeat numbers?
If so... I like:
a=30 b=100 d=100 c=80
Can you fill us in on exactly what it's all for?