1/3/4* 12 1 divided by 3/4 quotient times 12.

It can be divided into 70 parts 50a=70 parts 98b=70 parts 35c.

Because 98 is greater than 50 and greater than 35.

So the reason why B is greater than A and C is because in such an equation, letters multiplied by smaller numbers represent larger numbers, and letters multiplied by larger numbers represent smaller numbers.