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8. A jar full of whiskey contains 40% alcohol. A part of this whisky is replaced by another containing 19% alcohol and now the percentage of alcohol was found to be 26%. The quantity of whisky replaced is | |

A. $\dfrac{3}{4}$ | B. $\dfrac{3}{2}$ |

C. $\dfrac{2}{3}$ | D. $\dfrac{4}{3}$ |

Answer: Option C

Explanation:

Concentration of alcohol in 1st Jar = 40%

Concentration of alcohol in 2nd Jar = 19%

After the mixing, Concentration of alcohol in the mixture = 26%

By rule of alligation,

Concentration of alcohol in 1st Jar | Concentration of alcohol in 2nd Jar | |||||||||

40% | 19% | |||||||||

Mean | ||||||||||

26% | ||||||||||

26-19=7 | 40-26=14 |

Hence ratio of 1st and 2nd quantities = 7 : 14 = 1 : 2

i.e., $\dfrac{2}{1+2}=\dfrac{2}{3}$ part of the whisky is replaced.

Mohan

2016-11-25 16:34:38

1st and 2nd whiskeys are mixed in ratio 1:2

so we can take total mixture = 1+2 = 3

so

liquid 1= 1/3

liquid 2= 2/3

i.e. replaced liquid is__2/3__ same as 2nd whiskey

so we can take total mixture = 1+2 = 3

so

liquid 1= 1/3

liquid 2= 2/3

i.e. replaced liquid is

Gkrishna

2014-10-13 08:41:01

Explanation answer has ratio 1:2 while there is no 1:2 option for this question

Ajitha Kumari

2014-10-16 22:11:30

Ratio of 1st and 2nd quantities is obtained as 1 : 2

in other words, in the mixture, Quantity of first liquid : Quantity of the second liquid = 1 : 2

it means, the first liquid is only 1/3 in the mixture

so 2/3 of the mixture is replaced

in other words, in the mixture, Quantity of first liquid : Quantity of the second liquid = 1 : 2

it means, the first liquid is only 1/3 in the mixture

so 2/3 of the mixture is replaced

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