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Some people form a joint account for one year with the condi

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Manager
Joined: 18 Dec 2012
Posts: 96
Location: India
Concentration: General Management, Strategy
GMAT 1: 660 Q49 V32
GMAT 2: 530 Q37 V25
GPA: 3.32
WE: Manufacturing and Production (Manufacturing)
Some people form a joint account for one year with the condi  [#permalink]

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Updated on: 03 Sep 2013, 07:08
2
6
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Difficulty:

85% (hard)

Question Stats:

58% (03:31) correct 42% (03:26) wrong based on 126 sessions

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Some people form a joint account for one year with the condition that every month each member deposits an amount equal to the number of members in the account in that month. Also, the person who withdraws from the account before the end of the year get his/her amount at the end of the year. After 6 months, 1/4th of the people withdraw and 1/3rd of the remaining withdraw after 3 months. At the end of the year there is an amount of Rs. 4860 in the account before paying of the withdrawn amounts. Find out the number of people in the beginning of the year.

A. 12
B. 24
C. 36
D. 48
E. 60

_________________

I'm telling this because you don't get it. You think you get it which is not the same as actually getting it. Get it?

Originally posted by Qoofi on 03 Sep 2013, 07:03.
Last edited by Bunuel on 03 Sep 2013, 07:08, edited 1 time in total.
Renamed the topic and edited the tags.
Intern
Joined: 04 Aug 2013
Posts: 6
Re: Some people form a joint account for one year with the condi  [#permalink]

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03 Sep 2013, 17:41
Qoofi wrote:
Some people form a joint account for one year with the condition that every month each member deposits an amount equal to the number of members in the account in that month. Also, the person who withdraws from the account before the end of the year get his/her amount at the end of the year. After 6 months, 1/4th of the people withdraw and 1/3rd of the remaining withdraw after 3 months. At the end of the year there is an amount of Rs. 4860 in the account before paying of the withdrawn amounts. Find out the number of people in the beginning of the year.

A. 12
B. 24
C. 36
D. 48
E. 60

Need the solution, cant reach to B as the solution
Manager
Joined: 06 Jul 2013
Posts: 89
GMAT 1: 620 Q48 V28
GMAT 2: 700 Q50 V33
Re: Some people form a joint account for one year with the condi  [#permalink]

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03 Sep 2013, 19:42
1
N people in the start.

first 6 months there would 6.N.N money deposited.
1/4 members are gone so 3/4 left
Then next 3 month 3.3N/4.3N/4

then 1/3 of remaining gone = 3N/4*2/3 = N/2
so money deposited 3.N/2.N/2

total = 6N^2+27/16N^2+3/4N^2 = 4860
solve for N = 24
Manager
Joined: 18 Dec 2012
Posts: 96
Location: India
Concentration: General Management, Strategy
GMAT 1: 660 Q49 V32
GMAT 2: 530 Q37 V25
GPA: 3.32
WE: Manufacturing and Production (Manufacturing)
Re: Some people form a joint account for one year with the condi  [#permalink]

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03 Sep 2013, 23:30
1
Let x be the number of people in the beginning.
Amount deposited for 6 months = 6*x*x = 6x^2

Number of people for the next 3 months = x -x/4 = 3x/4

Amount deposited for the next 3 months = 3 * (3x/4)^2

Number of people for the last 3 months = 3x/4 - (1/3 * 3x/4) = x/2

Amount deposited for the last 3 months = 3* (x/2)^2

Total amount = 6x^2 + 27x^2/16 + 3x^2/4 = 4860

x= 24 (option B)
_________________

I'm telling this because you don't get it. You think you get it which is not the same as actually getting it. Get it?

Manager
Joined: 22 Aug 2014
Posts: 149
Re: Some people form a joint account for one year with the condi  [#permalink]

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14 Apr 2015, 04:37
Qoofi wrote:
Let x be the number of people in the beginning.
Amount deposited for 6 months = 6*x*x = 6x^2

Number of people for the next 3 months = x -x/4 = 3x/4

Amount deposited for the next 3 months = 3 * (3x/4)^2

Number of people for the last 3 months = 3x/4 - (1/3 * 3x/4) = x/2

Amount deposited for the last 3 months = 3* (x/2)^2

Total amount = 6x^2 + 27x^2/16 + 3x^2/4 = 4860

x= 24 (option B)

Why are we multiplying things two times(^2)?
Intern
Joined: 01 Apr 2015
Posts: 8
Re: Some people form a joint account for one year with the condi  [#permalink]

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15 Apr 2015, 00:00
ssriva2 wrote:
Why are we multiplying things two times(^2)?

Because at the end of each month, each person deposits an amount equal to the number of people. For example, if there are 24 people, each would deposit \$24 (or whatever currency the question is asking), meaning a total of 24*24 dollars is deposited. So if you start out with $$n$$ people:

> After month 1: ($$n$$ x $$n$$) deposited = $$n^2$$
> After month 2: +$$n^2$$ deposited
> After month 3: +$$n^2$$ deposited
> After month 4: +$$n^2$$ deposited
> After month 5: +$$n^2$$ deposited
> After month 6: +$$n^2$$ deposited

** Here, 1/4 of people leave and you are left with $$\frac{3}{4}n$$ people, each depositing $$\frac{3}{4}n$$ dollars **

> After month 7: +($$\frac{3}{4}n$$) x ($$\frac{3}{4}n$$) deposited = $$\frac{9}{16}n^2$$
> After month 8: +$$\frac{9}{16}n^2$$ deposited
> After month 9: +$$\frac{9}{16}n^2$$ deposited

** Here, 1/3 of the remaining people leave and you are left with $$(\frac{2}{3})(\frac{3}{4}n)$$ people, each depositing $$(\frac{2}{3})(\frac{3}{4}n)$$ dollars **
> After month 10: + ($$\frac{2}{3})(\frac{3}{4}n$$) x $$(\frac{2}{3})(\frac{3}{4}n)$$ = $$\frac{1}{4}n^2$$
> After month 11: +$$\frac{1}{4}n^2$$
> After month 12: +$$\frac{1}{4}n^2$$

Put it all together and for the 12-month period, you get:

$$6(n^2) + 3(\frac{9}{16}n^2) + 3 (\frac{1}{4})n^2 = 4860$$

Finally, solve to get:

$$n=24$$

Senior Manager
Joined: 02 Apr 2014
Posts: 476
Location: India
Schools: XLRI"20
GMAT 1: 700 Q50 V34
GPA: 3.5
Re: Some people form a joint account for one year with the condi  [#permalink]

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09 Mar 2018, 10:29
Let total number of people = 12x (LCM of 4,3)

first 6 months: deposits = $$6 * 12x * 12x = 864x^2$$
(1/4) withdraw, so remaining people = 9x
months 7,8,9: deposits = $$3 * 9x * 9x = 243x^2$$
(1/3) of remaining withdraw, so remaining people = 6x
months 10,11,12: deposits = $$3 * 6x * 6x = 108x^2$$

so total amount =$$864 x^2 + 243x^2 + 108x^2 = 4860$$
= $$1215 x^2 = 4860 => x = 2$$
number of people = 12x = 24
Director
Joined: 14 Nov 2014
Posts: 628
Location: India
GMAT 1: 700 Q50 V34
GPA: 3.76
Re: Some people form a joint account for one year with the condi  [#permalink]

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10 Mar 2018, 03:17
1
Qoofi wrote:
Some people form a joint account for one year with the condition that every month each member deposits an amount equal to the number of members in the account in that month. Also, the person who withdraws from the account before the end of the year get his/her amount at the end of the year. After 6 months, 1/4th of the people withdraw and 1/3rd of the remaining withdraw after 3 months. At the end of the year there is an amount of Rs. 4860 in the account before paying of the withdrawn amounts. Find out the number of people in the beginning of the year.

A. 12
B. 24
C. 36
D. 48
E. 60

Back solved it :
take 36 ..amount after 6 month 36*36*6--way beyond the final amount --discard ..so C , D , E all discarded
Take 24 = 24*24*6 =3456
1/4 drops = left = 18 ...new amount for 3 mnth = 18*18*3 = 972
1/3 drops = left 12 = new amount for 3 mnth =12*12*3= 432
total 4860.
Re: Some people form a joint account for one year with the condi   [#permalink] 10 Mar 2018, 03:17
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