how is the bolded solution prepared for e and f

e) 250 ml of IX SDS buffer. You are provided with a 500ml of 6X SDS buffer. How much water and how much of the 6X SDS buffer solution do you have to use to make 250 ml of 1X SDS buffer? f) 6L of 1 mM IPTG. You need to prepare a stock solution of IM IPTG that will be sufficient to give you 6L of ImM IPTG once it is diluted. How much water and how much IPTG (in grams) will you need to make a sufficient 1M stock solution