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#1 2005-01-30 04:47:13
- indira
- Guest
population problem
A town in India has a population of 20,000 people. Five percent of them are one-legged, and half the others go barefoot. How many sandals are worn in the town?
#2 2005-01-30 08:16:01
- MathsIsFun
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Re: population problem
Well, how many unfortunate one-legged citizens in town? 5% of 20,000, which is 5 x 20,000 / 100 = 100,000/100 = 1,000 of them.
And therefore there are 19,000 with two legs.
If half go barefoot then there would be 19,000/2 who wear two sandals and 1,000 who wear one sandal.
19,000/2 x 2 + 1000/2 x 1 = 19,000 + 500 = 19,500.
Is this right?
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
#3 2005-02-19 05:29:56
- Saz000
- Guest
Re: population problem
20000 people
5 % have one shoe each = 1000 shoes
PLUS half of the rest (19000/2 = 9500) have
two shoes each (9500 x 2) = 19000 shoes
Total = 20,000 shoes
One thousand one legged people wear
one thousand shoes, not 500!!!
(I think)
#4 2005-02-19 07:20:48
- MathsIsFun
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Re: population problem
Good one, Saz000! The original problem said half the OTHERS, whereas I assumed half of all did. So it is saying that EVERY one-legged person wears sandals, so you are right.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman