Pardon me for addressing this post to the list.
I see that the solution suggested for question # 1b by Mr. S P Sharma
isn't
correct and it needs be known to fellow list members so that they can
correct themselves. If one multiplies 15000 by 95% twice to get the
population 2 years back then the answer is 135375. This answer is
incorrect,
the correct answer is 13605.
Here's the explanation:
Let x be the population 2 years back.
1 year back the population would be:
x + 0.05x
=1.05x
Current year the population would be:
1.05x + (0.05 * 1.05)x
=1.05x + 0.0525x
=1.1025x
Given that current year the population is 15000.
So, 1.1025x = 15000
Therefore, x = 15000 / 1.1025
=13605.44 rounded off to 13605.
Note that 5% of 100 is 5 but 5% of 95 is 4.75 not 5. So, if the
population
1
year back is 95 then current year it would be 95+4.75=99.75 and not 100.
The compound interest method suggested by Mr. Vedprakash fits in best for
such problems, it's shorter than the above method. I mentioned the above
method to explain how it works.
Hope this is clear...
Best Regards,
Zujar.
An optimist laughs to forget and a pessimist forgets to laugh!
-----Original Message-----
From: AccessIndia [mailto:accessindia-boun...@accessindia.org.in] On
Behalf
Of Vedprakash
Sent: Sunday, June 23, 2013 11:25 AM
To: accessindia@accessindia.org.in
Subject: Re: [AI] help me in understanding the method for solving such
type
of mathematical problems
Sorry for a wrong answer of the second question. sending the same again.
2. In a class 35% students failed in hindi, 45% failed in english
subjects
respectively. 20% students failed in both subjects, find out the
percentage
of the students who passed in both subjects.
Total numbers of the students: = 100
Failed in Hindi = 35%
Passed in Hindi: = 100 minus 35 = 65.
Failed in English: = 45
passed in English = 100 minus 45 = 55.
failed in both = 20.
Passed in either Hindi or English = 100 minus 20 = 80.
Passed in Both =
A. Passed in either Hindi or English minus Passed in Hindi = 80 minus 65
=
15 Plus B. Passed in either Hindi or English minus Passed in English
=80 minus 55 = 25
= A plus B
=15 plus25
=40 Answer.
----- Original Message -----
From: "Mohib Anwar Rafel" <mohibra...@gmail.com>
To: "accessindia" <accessindia@accessindia.org.in>
Sent: Saturday, June 22, 2013 9:34 PM
Subject: [AI] help me in understanding the method for solving such type
of
mathematical problems
Hi friends I am unable to understand the way to solve the following
problems, even I couldn't understand it by reading R. S. Agarwal book.
please guide me.
1. If the population of a town is 1,50,000 at present, it is
increasing at the rate of 5% per annum,
(a) what will be the population of the town after 2 years?
(b) what was the population of the town before 2 years?
2. In a class 35% students failed in hindi, 45% failed in english
subjects respectively. 20% students failed in both subjects, find out
the percentage of the students who passed in both subjects.
--
Mohib Anwar Rafel
M.Phil/Masters in International Law, Center for International Legal
Studies JNU.
Pursuing Masters of Law, at University of Delhi
Phone: 09811767506,
01127666896
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