# Thread: Reduction of grain by 80%.

1. ## Reduction of grain by 80%.

a farmer has some grain, which he would like to have sold, but unfortunately there is very much moisture in the grain. there are actually 90% moisture in the grain and you will probably not call it corn any more , but there is a man who would like to buyit but he would only buy when the moisture percentage is down at 80%
it is about 100 kg grain (with moisture) and the question is now how much weight grain (with moisture) when it is down to 80% moisture when the man will buy?

2. ## Re: Help!!!!

Ok, so the grain has two components: the 'solid stuff' and the moisture. Moisture disappears during the drying process, but the mass of the solid stuff remains the same. You start out with $\displaystyle (100\% - 90\%)\cdot 100 \mathrm{kg}=10\mathrm{kg}$ of solid stuff. After the drying process you still have 10 kg of solid stuff, but now it's $\displaystyle (100\% - 80\%)$ of the total mass. I'll leave it up to you do the last calculation step.