How many grams of CaCl2 are needed to make 608.9g of solution that is 35.5% (m/m) calcium chloride in water?

How many grams of CaCl2 are needed to make 608.9g of solution that is 35.5% (m/m) calcium chloride in water? Note that mass is not technically the same thing as weight but %(m/m) has the same meaning as % w/w.? How many grams of water are needed to make this solution?