text: let x=calories in a cup of raisins. Then there are x+400 calories in a cup of sunflower seeds.\n2(x+400)+3x=2900\n2x+800+3x=2900\n5x=2100\nx=420calories per cup of raisins\nthere are 420+400=820 cal/cup of sunflowers seeds\ncheck\n2*820+3*420=1640+1260=2900 total.