Adding Reply Archived Topic: It will not be bumped to the top of the forum. Topic Math Help II Membername   Not a member? Sign Up Free (takes 20 seconds) Password   Forgotten your password? Post Font: Verdana Arial Black Georgia Comic Sans Impact   Size: Tiny Normal Big Huge   Color: Default Dark Red Red Orange Brown Green Olive Cyan Blue Dark Blue Indigo Black [ Check Spelling ] [ Post Preview ] [ LiveTags ] FAQ Keyword Search: Post Options Favorites Manager Notify me of new replies to this topic by email Notify me of new replies to this topic by private message Original Post Dr Gregory House Posted at 11:37 pm on April 23, 2008 Yeah, this is the last one before I go to bed. A rancher is preparing an oat-cornmeal mixture for livestock. Each ounce of oats provides 5 grams of protein and 17 grams of carbohydrates, and an ounce of cornmeal provides 3 grams of protein and 24 grams of carbohydrates. How many ounces of each can be used to meet the nutritional goals of 260 grams of protein and 1505 grams of carbohydrates per feeding? In advance, no, there's no picture or diagram...sorry. Thanks for the help.

Replies sanzilla Posted at 11:38 am on April 28, 2008 anyway you got it , just feel free to ask any idiotz question in here. qwerky Posted at 12:51 am on April 24, 2008 ok. this involves simultaneous equations.   first you need to work out what are the equations. for the first equation, you work out how much protein from both oats and cornmeal to make 260grams. so.. if x = oz of oats, and y = oz of cornmeal the equation will be: 5x+3y = 260......(eq 1) and do the same for carbohydrates to eqaul 1505 grams: if x = oz of oats, and y = oz of cornmeal the equation will be: 17x+24y = 1505......(eq 2) now you have to eliminate one of the pronumerals (x or y) so you can find one of them, which will help in finding the other. to do this, you see if one of the terms are the same in each equation. in this case, there isnt. so you multiply one of the equations so a term appears in both. in this example, lets multiply [eq. 1] by 8, because if we multiply 3y by 8, we get 24y, which is found in eq. 2. so... eq 1: (5x+3y = 260) x 8 = 40x+24y = 2080. now we can subtract [eq. 1] from [eq. 2] to find x. so... eq 1: 40x+24y = 2080. eq 2: 17x+24y = 1505. [eq. 2] minus [eq. 1] 17x + 24y - (40x+24y) = 1505 - 2080 17x - 40x + 24y -24y = -575 -23x = -575 x = 25 now you can sub x into one of the equations (lets make it eq 1, because its easier) to find y. so... eq 1: 5x+3y = 260 sub x = 25 5(25)+3y = 260 125+3y = 260 3y = 135 y = 45 So you have your answers: if x = 25 oz of oats and y = 45 oz of cornmeal....TA DA!! I know this may be a VERY LONG explanation, but i just want to make sure i was clear, and so you know what's happening.   Dr Gregory House Posted at 11:42 pm on April 23, 2008 Quote: from MrMark at 2:39 am on April 24, 2008 bloody hell do your homework yourself noob This shit's a waste of my time, I'm a Liberal Arts major for God's sake.  It's bullshit. Less of a n00b than you.  At least I answer people's questions with something other than "bloody hell" in every post.  Yeah, good for you, you're a Brit., everyone's jealous of your accent, etc., etc. Now help me or get off LW. MrMark Posted at 11:39 pm on April 23, 2008 bloody hell do your homework yourself noob CanItBePardonTimeNow Posted at 11:38 pm on April 23, 2008 GoLiveWire.com The stuff dreams are made of. All 5 previous replies displayed.