<p>Does anyone know a way to set up this three-way proportion?</p>
<p>If 15 cans of food are needed for seven adults for two days, the number of cans needed to feed four adults for sven days is?</p>
<p>I've been racking my brain trying to solve this, but can't figure it out.</p>
<p>i think the answer is 30</p>
<p>What is it. Is it 60?</p>
<p>Well the original can be changed to it feeds 14 adults in one day, and you want to feed 28 adults in one day. that would be 30 cans.</p>
<p>can u guys give me the set up/solution?</p>
<p>railroad tracks!</p>
<h2>15 cans | 1 day</h2>
<p>2 days | 7 adults</p>
<p>so it would be cans/(days x adults) and set the proportion up that way.</p>
<p>so cans and days are directly proportional to each other because if the number of cans go up, then people will survive for more days. since both increases, those are directly proportional.</p>
<p>however, adults and days are inversely proportional because if the number of adults decrease, then there will be less people, which means that there will be more food for everybody, which means that people will live longer, which means that days would increase.</p>
<p>it goes like this:
less adults -> more food for remaining adults -> live for a longer time because there's more food available -> number of days increase.</p>
<p>So set the proportion up the same way for the other one with the unknown number of cans and you'll get 30 as an answer!</p>
<p>I hoped that helped mucho :)</p>
<p>thank you very much angiee; that explaination helped mucho :)</p>