One serving of tomato soup contains 100 Cal and 18 g of carbohydrates. One slice of whole

Question:

One serving of tomato soup contains 100 Cal and 18 g of carbohydrates. One slice of whole wheat bread contains 70 Cal and 13 g of carbohydrates. (Source: Home and Garden Bulletin No. 72, U.S. Government Printing Office, Washington, D.C. 20402) How many servings of each would be required in order to obtain 230 Cal and 42 g of carbohydrates?