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-   -   Interesting Riddle (http://forums.pelicanparts.com/off-topic-discussions/1005216-interesting-riddle.html)

javadog 08-17-2018 01:18 PM
If they lost that much weight overnight, they were some pretty ****ty potatoes...

I suspect foul play, or a herd of raccoons.

dad911 08-17-2018 01:24 PM
What is their new weight?

99 lb.

red-beard 08-17-2018 01:27 PM
Quote:
Originally Posted by 1990C4S (Post 10146701)
I think you need 49 lbs of water, plus 1 lbs of starch to get 50 lbs.

98% water is 49 lbs of water and 1 lbs of starch, total new weight is 50 lbs.

1/50th is 2%...water is 98%...
typo, yes, 49lbs, so 50 lbs water loss

Jims5543 08-17-2018 01:29 PM
Quote:
Originally Posted by dad911 (Post 10146718)
What is their new weight?

99 lb.
That was my initial thought as well without working out much more than they lost 1% of their water volume and they are 98% water so 1% = 0.99 lbs.

Am I missing something here?

1990C4S 08-17-2018 01:32 PM
Quote:
Originally Posted by Jims5543 (Post 10146725)
That was my initial thought as well without working out much more than they lost 1% of their water volume and they are 98% water so 1% = 0.99 lbs.

Am I missing something here?
Yes, the math behind it. In your scenario there's 98 lbs of water, 1 lbs of potato.

That's 98.98% water. (98 divided by 99)

To get to 98% water you need 1 lb of potato and 49 lbs of water... (49 divided by 50)

Jims5543 08-17-2018 01:35 PM
I read it this way.

The mathematical potatoes, which are not actual potatoes, are composed of 99% water. When left out overnight they were then composed of 98% water or 1% less water then the day before.

1% of 99% = 0.99 rounding off.

1990C4S 08-17-2018 01:39 PM
Quote:
Originally Posted by Jims5543 (Post 10146740)
I read it this way.

The mathematical potatoes, which are not actual potatoes, are composed of 99% water. When left out overnight they were then composed of 98% water or 1% less water then the day before.

1% of 99% = 0.99 rounding off.
The first part is correct. The math after that is not. That method would work if the mass of the potato changed also.

aschen 08-17-2018 01:49 PM
evening
water / (water + solids) = .99
water + solids = 100 lbs
Solids = 1 lb
water = 99 lbs

Morning
Assumption solids are conserved (1st low of Idahodynamics)
Solids =1 lb
Water + solids = ?
water/(water+solids) = .98
water = 49 lbs

Therefor ? = 50.0 Lbs

tabs 08-17-2018 02:23 PM
Potatoes weight 100 lb on the scale....of that 99lbs is water 1 lb other stuff. = 100lb
Tomorrow you come out and find shriveled up potatoes???? I don't think so...

Today your Potatoes are 97 lbs.

Shaun @ Tru6 08-17-2018 02:25 PM
What is the potatoes grew sprouts. Would they weigh or less than the original potatoes?

black73 08-17-2018 02:42 PM
Quote:
Originally Posted by stomachmonkey (Post 10146561)
Yeah I think I got it wrong the first time around.

Let's see how fast one of you geniuses can get it.

Fred brings home 100 pounds of potatoes, which (being purely mathematical potatoes) consist of 99 percent water. He then leaves them outside overnight so that they consist of 98 percent water. What is their new weight?
You guys are turning a riddle into a math problem. New weight same as the old weight, just less % of water.

dad911 08-17-2018 04:42 PM
Quote:
Originally Posted by Jims5543 (Post 10146725)
That was my initial thought as well without working out much more than they lost 1% of their water volume and they are 98% water so 1% = 0.99 lbs.

Am I missing something here?
Yup, me too.

I now concur with Redbeard and c4s.

DRONE 08-17-2018 04:51 PM
1 lb. Of water = 7 lbs. So 93 lbs total.

dad911 08-17-2018 04:58 PM
Quote:
Originally Posted by DRONE (Post 10146945)
1 lb. Of water = 7 lbs. So 93 lbs total.
1 lb. Of water = 7 lbs ????:eek::eek:

Crowbob 08-17-2018 05:14 PM
But a pound of potatoes has to weigh more than a pound of water.

R K T 08-17-2018 05:31 PM
I had some french fries for lunch.

gduke2010 08-17-2018 05:37 PM
Approximately, 99lb

RKDinOKC 08-17-2018 06:27 PM
Mathematical Potatos
P is Potatos
W is water
T is Taters (the part not water.)

Given P = T + W = 100lb where W = 99T
Find Px where Wx = 98T

T + 99T = 100
T ( 1 + 99) = 100
T = 1 lb

T + Wx = Px
T + 98T = Px
1 + 98 = Px
99 = Px

Mathematically

Steve Carlton 08-17-2018 06:44 PM
http://forums.pelicanparts.com/uploa...1534560234.jpg

Steve Carlton 08-17-2018 06:51 PM
The potatoes start out as 1 pound of solids and 99 pounds of water. 99/100 = 99% water.

The one pound of solids become 2% of what? 1/50 = 2%. 49/100 = 98% water. 49 + 1 = 50 pounds.


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