how smart are you????? answer this question.....

ok so the watermellons were rotting, and hence the skins were water permeable

damnit

wouldn't we have to know how heavy the non water part of the watermelon is (not percentage, but ratio compared to water?)

that 1% could be 10% of the watermelons weight or 20%, we do not know, therefore there is no way to know the answer.

or now that i think about it, the non water part was 1% and is now 2%, so if that has doubled, then the water has halfed??

my brain hurts?

if 99% is 10 tonnes, then 98% = 98/99 x 10 = 8.89999 tonnes

10 tonnes still.

Why still 10 tonnes fitz?

WE want the answer!!!

5 tons. You can find it using ratios or by setting up an equation and solving for the unknown variable, the trick is to set up the right equation!
P.S. If left long enough, water will evaporate from watermelons as their skin is semi-permeable. However, you just wouldn't lose that much water overnight. :D

5 tons? Hahaha

I don't know much about evaporation (technical aspects at least) so unless theres some sort of special trick to it…

and the answer is….. yes 5 tons!
2 people got it write… well done to norman, and synchro!

yeah it's all do do with ratios…. let me try to explain!

since 99% of the mass is water to start with then the non water mass must = 1% of 10 tons……or 0.1 tons.

then the next day…

the solid mass…the 0.1 tons, will still be the same, but since now only 98% of the mass is made up by water, then this non water part makes up 2% of the total mass.

therefore…..

to get 100 you must x 2 by 50! therefore, to get 100% you must times the 2% part (=to 0.1 tons) by 50

answer 5 tons!

hope you followed that!

I think I might try and get a new question like this every week, to keep the brains working… or at least confused:P

oh and only 2 people got it right, thats only 6.06% of the people who voted!

gearwhore had the right idea, unfortunately he probably voted wrong though.

i wish i'd have seen this earlier, so i could've been in on letting the cat out of the bag….

keith - this is just one of your homework problems you need help with, and you're wanting to disguise it, isn't it??? :P (jk)

hehehe well i did get asked it while in a technical drawing class…. I have many more of the sort!:)

i know that i'm an idiot…..thanks for rubbing it in :mad:

Originally posted by Keefer
5 tons? Hahaha

Sucka!

Another way to solve this is to set up an equation. From the original info we know that only the water weight changes so the non-water weight remains constant. Therfore:

10 tons watermelons - water weight = non-water weight

10 tons - (10 tons x 99%) = 0.1 tons, the non-water weight.

If we replace the 10 tons with a variable for the new unknown weight we get:

Let U= unknown weight

U tons - (U tons x 98%) = 0.1 tons of non water weight

U - 0.98U = 0.1
0.02U = 0.1
2U = 10
U = 10/2
U = 5