A realtor is decorating some homes for sale, putting a certain number of decorative pillows on each twin bed and a certain number on each queen bed. In one house, she decorated 2 twin beds and 2 queen beds and used a total of 40 pillows. At another house, she used 70 pillows to spruce up 2 twin beds and 4 queen beds. How many decorative pillows did the realtor arrange on each bed? The realtor used pillows on every twin bed and pillows on every queen bed. *