text: need help on one more algebra problem? paula mixed to cups of sunflower seeds and 3 cups of raisins to make a snack for her hike. she figured that the mixture would provide her with 2900 calories of food energy. find the number of calories per cup of raisins if it is 400 less than the number of calories per cup of sunflower seeds   use only one variable let x=calories in a cup of raisins. then there are x+400 calories in a cup of sunflower seeds. 2(x+400)+3x=2900 2x+800+3x=2900 5x=2100 x=420calories per cup of raisins there are 420+400=820 cal/cup of sunflowers seeds check 2*820+3*420=1640+1260=2900 total.