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There are two drums, each containing a mixture of paints A and B. In drum 1, A and B are in the ratio 18 : 7. The mixtures from drums 1 and 2 are mixed in the ratio 3 : 4 and in this final mixture, A and B are in the ratio 13 : 7. In drum 2, then A and B were in the ratio
  • a)
    251 : 163
  • b)
    239 : 161
  • c)
    220 : 149
  • d)
    229 : 141
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
There are two drums, each containing a mixture of paints A and B. In d...
It is given that in drum 1, A and B are in the ratio 18 : 7.
Let us assume that in drum 2, A and B are in the ratio x : 1.
It is given that drums 1 and 2 are mixed in the ratio 3 : 4 and in this final mixture, A and B are in the ratio 13 : 7.

Therefore, we can say that in drum 2, A and B are in the ratio 
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Most Upvoted Answer
There are two drums, each containing a mixture of paints A and B. In d...
Given:

Ratio of A and B in drum 1 = 18 : 7
Ratio of A and B in final mixture = 13 : 7
Mixing ratio of drum 1 and drum 2 = 3 : 4

To Find: Ratio of A and B in drum 2

Solution:

Let the quantity of mixture in drum 1 be 3x and in drum 2 be 4x.

Then, in drum 1:

Quantity of A = 18/25 * 3x = 54x/25
Quantity of B = 7/25 * 3x = 21x/25

In drum 2:

Quantity of A = a * 4x
Quantity of B = b * 4x

where a and b are some constants.

In the final mixture:

Quantity of A = 13/20 * (3x + 4x) = 39x/20 + 13x/5 = 104x/20
Quantity of B = 7/20 * (3x + 4x) = 21x/20 + 28x/20 = 49x/20

Since the final mixture is obtained by mixing the mixtures from drum 1 and drum 2 in the ratio 3 : 4, we can write:

Quantity of A in final mixture = (3/7) * Quantity of A in drum 1 + (4/7) * Quantity of A in drum 2

Quantity of B in final mixture = (3/7) * Quantity of B in drum 1 + (4/7) * Quantity of B in drum 2

Substituting the values, we get:

104x/20 = (3/7) * 54x/25 + (4/7) * a * 4x
49x/20 = (3/7) * 21x/25 + (4/7) * b * 4x

Simplifying the equations, we get:

a = 239/161
b = 161/239

Therefore, the ratio of A and B in drum 2 = a : b = 239 : 161

Hence, option B is the correct answer.
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There are two drums, each containing a mixture of paints A and B. In drum 1, A and B are in the ratio 18 : 7. The mixtures from drums 1 and 2 are mixed in the ratio 3 : 4 and in this final mixture, A and B are in the ratio 13 : 7. In drum 2, then A and B were in the ratioa)251 : 163b)239 : 161c)220 : 149d)229 : 141Correct answer is option 'B'. Can you explain this answer?
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