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Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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27 Aug 2014, 23:42

8

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00:00

A

B

C

D

E

Difficulty:

65% (hard)

Question Stats:

65% (01:52) correct
35% (01:44) wrong based on 144 sessions

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Each of the four identical containers (A,B,C and D) contains ‘b’ balls. When some of the balls from container A are moved to the other 3 containers, the ratio of the number of the balls in A,B,C and D are in the ratio 1:4:4:3. How many balls are moved from the first container in terms of ‘b’?

Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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28 Aug 2014, 00:00

alphonsa wrote:

I got the answer be taking a number for 'b' .

But can someone tell me there is a better method to solve this. If deriving is better than taking values.

Also I am able to get answers for Quant but invariably it takes a lot of time sometimes to get the answer.

Would you suggest some method to improve speed

I don't want to miss out on questions because of speed.

Any suggestions to build speed?

We have different methods to approach this problem,

1st look at the answer choices, all the values contain denominator 6. So B must be a multiple of 6, only then the value for all the answer choices will be an integer.

Since we cannot have the number of balls in fractions.

Now plugging a value. Clue here is answer choices. So take b=6.

If all the jars has same number of (b) balls initially, then the total number of balls will be 6+6+6+6= 4*6= 24.

We are removing some balls from jar A and moving it to other jars. The ratio is 1:4:4:3.

Notice that, we are not adding new balls from outside. So the sum will be always equal to 24.

Let x be the multiplier, then

1x+4x+4x+3x= 24.

12x=24

x=2.

Now, the number of balls in each jar will be,

A:2 B:4*2=8 C:4*2=8 D: 3*2=6

Initially we had 6 balls in jar A. Now we have 2 balls. So 4 balls removed from the jar A.

Check the answer choices which gives us the value of 4, when we substitute b=6.

Re: Each of the four identical containers (A,B,C and D) contains ‘b’ [#permalink]

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28 Aug 2014, 00:16

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This post received KUDOS

alphonsa wrote:

Each of the four identical containers (A,B,C and D) contains ‘b’ balls. When some of the balls from container A are moved to the other 3 containers, the ratio of the number of the balls in A,B,C and D are in the ratio 1:4:4:3. How many balls are moved from the first container in terms of ‘b’?

A) (5/6)b B) (1/6)b C) (2/6)b D) (4/6)b E) (3/6)b

Source: 4Gmat

After ball movement, the ratio = 1:4:4:3

Before ball movement, all 4 containers had same "b" no. of balls = 3:3:3:3

Comparing before/after ratios.....

It means 2 balls (out of 3) were taken out from A; 1 went in B & 1 went in C (No change in D)

Re: Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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28 Aug 2014, 00:39

Paresh's approach is the quickest that I know of. Although the numbers are relatively easy in this question, I'd choose the denominator of the solutions as b (ie 6 in this question), that way I can be sure of getting an integer.

Re: Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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06 Mar 2016, 20:55

Gnpth wrote:

alphonsa wrote:

I got the answer be taking a number for 'b' .

But can someone tell me there is a better method to solve this. If deriving is better than taking values.

Also I am able to get answers for Quant but invariably it takes a lot of time sometimes to get the answer.

Would you suggest some method to improve speed

I don't want to miss out on questions because of speed.

Any suggestions to build speed?

We have different methods to approach this problem,

1st look at the answer choices, all the values contain denominator 6. So B must be a multiple of 6, only then the value for all the answer choices will be an integer.

Since we cannot have the number of balls in fractions.

Now plugging a value. Clue here is answer choices. So take b=6.

If all the jars has same number of (b) balls initially, then the total number of balls will be 6+6+6+6= 4*6= 24.

We are removing some balls from jar A and moving it to other jars. The ratio is 1:4:4:3.

Notice that, we are not adding new balls from outside. So the sum will be always equal to 24.

Let x be the multiplier, then

1x+4x+4x+3x= 24.

12x=24

x=2.

Now, the number of balls in each jar will be,

A:2 B:4*2=8 C:4*2=8 D: 3*2=6

Initially we had 6 balls in jar A. Now we have 2 balls. So 4 balls removed from the jar A.

Check the answer choices which gives us the value of 4, when we substitute b=6.

Only one option does that.

So Answer is D.

Hope it helps.

here is my approach each jar has initially b balls next after removing => x,4x,4x,3x balls in A = x+4x-b+4x-b+3x-b = 12x-3b b=12x-3b => x=b/3

now balls removed from A= b-b/3 = 2b/3 =4b/6 => option D..

is it wrong to think like this? Anyways your solution is awesome and it takes less time..

Re: Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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06 Apr 2016, 18:35

alphonsa wrote:

Each of the four identical containers (A,B,C and D) contains ‘b’ balls. When some of the balls from container A are moved to the other 3 containers, the ratio of the number of the balls in A,B,C and D are in the ratio 1:4:4:3. How many balls are moved from the first container in terms of ‘b’?

A) (5/6)b B) (1/6)b C) (2/6)b D) (4/6)b E) (3/6)b

Source: 4Gmat

i solved it algebraically and it took me under 1 minute to do so.

we have 1x:4x:4x:3x = total =12x. we know that 12x=4b b=3x

now, we are left with 1 x, then 2x must have been removed. (2x/3x)*b since we need 4 in denominator, multiply everything by 2: (4/6)b

Re: Each of the four identical containers (A,B,C and D) contains ‘b’ balls [#permalink]

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27 Oct 2017, 21:28

alphonsa wrote:

Each of the four identical containers (A,B,C and D) contains ‘b’ balls. When some of the balls from container A are moved to the other 3 containers, the ratio of the number of the balls in A,B,C and D are in the ratio 1:4:4:3. How many balls are moved from the first container in terms of ‘b’?

A) (5/6)b B) (1/6)b C) (2/6)b D) (4/6)b E) (3/6)b

Source: 4Gmat

Let \(y\) balls be transferred from A to other three containers. we need to find the value of \(y\)

After the transfer number of ball in each container be \(x\), \(4x\), \(4x\) & \(3x\)

number of balls left in container A; \(x= b-y\)

And total number of balls in the remaining three containers after increment of \(y\); \((4x+4x+3x)=3b+y => 11x=3b+y\)

substitute the value of \(x\) in the above equation to get