Aptitude - Alligation or Mixture - Discussion
Discussion Forum : Alligation or Mixture - General Questions (Q.No. 3)
3.
A can contains a mixture of two liquids A and B is the ratio 7 : 5. When 9 litres of mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7 : 9. How many litres of liquid A was contained by the can initially?
Answer: Option
Explanation:
Suppose the can initially contains 7x and 5x of mixtures A and B respectively.
| Quantity of A in mixture left = |  |
7x - | 7 | x 9 |  |
litres = | |
7x - | 21 | litres. |
| 12 | 4 |
| Quantity of B in mixture left = | |
5x - | 5 | x 9 | |
litres = | |
5x - | 15 | litres. |
| 12 | 4 |
 |
|
= | 7 | |||||
|
9 |
 |
28x - 21 | = | 7 |
| 20x + 21 | 9 |
252x - 189 = 140x + 147
112x = 336
x = 3.
So, the can contained 21 litres of A.
Discussion:
100 comments Page 9 of 10.
Shiv Raj said:
9 years ago
Thanks for your explanation @Prabhas.
Deepthi said:
10 years ago
Can any one explain it again please?
Renu said:
1 decade ago
Hi Vaishali can you please explain.
Karen said:
8 years ago
Do we use the ratio? Please tell.
San said:
1 decade ago
Is there any easy way to do it ?
Vijay padala said:
9 years ago
Good explanation, thanks to all.
Keerthana said:
9 years ago
9 x 7 = 63 how you got 81@Silu.
Sus said:
1 decade ago
@Silu your explanation is good.
Teja said:
1 decade ago
Can You explain in other way ?
Amara said:
1 decade ago
How to calculate mixture left?
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