There are many ways you can go about doing this. One example is 430÷2=215. I am assuming you are doing multiplication at this time, or you have a calculator nearby. A way you would solve this is choosing a number between 200 and 250, then multiply that by "x"(any number you so choose). The number you would get is "y"(the product of x×your number between 200 and 250). Your equation would then be y÷x=number you choose between 200-250