In 40 litres of a mixture the ratio of milk to water is 7:1. In order to make the ratio of milk to water as
3:1, the quantity of water that should be added to the mixture will be
Choices.
A) 523 litre
B) 413 litre
C) 623 litre
D) 6 litre
E) None of these
Explanation :   By the rule of alligation, we have   623 litreoncentration of water   in pure water : 1 623 litreoncentration of water   in mixture : 1/8   623 litreoncentration of water in the final mixture   1/4   1/4 - 1/8 = 1/8 1 - 1/4 = 3/4   Quantity of water : Quantity of mixture = 1/8 : 3/4 = 1 : 6   Given that quantity of mixture = 40 litre   =&gt;Quantity of water : 40 = 1 : 6   ⇒Quantity of water = 40×16=623 litre   Answer : Option 623 litre
<result>C</result>
In 40 litres of a mixture the ratio of milk to water is 7:1. In order to make the ratio of milk to water as
3:1, the quantity of water that should be added to the mixture will be