Mixtures and Alligation

Six coins of equal weight, made of gold and silver are melted together and recast. The ratio of gold and silver in one of these is 2 : 1, in two other it is 3 : 5 and in the remaining 7 : 5. In the new coins the ratio of gold and silver is

The ratio of ink and water in $66$ litres of adulterated ink is $5 : 1$. The quantity of water to be added in the mixture to make the ratio of ink and water $5 : 3$ is

Find the ratio in which rice at Rs. $7.20$ one kg be mixed with rice at Rs. $5.70$ one kg to produce a mixture worth Rs. $6.30$ a kg.

The ratio of copper and zinc in an alloy is $9:5$. If the weight of zinc in the alloy is $9.5gm$, then weight of copper in it is ______ .

Two solutions of $90\%$ and $97\%$ purity are mixed resulting in $21$ litres of mixture of $94\%$ purity. How much is the quantity of the first solution in the resulting mixture?

In a sphere made of an alloy, copper and tin are in the ratio $86:14$. In a sphere made of another alloy, copper and zinc are in the ratio $58:42$. Find the ratio of tin and zinc in the sphere made by melting the two spheres.

Two vessels A and B contain milk and water mixed in the ratio $8:5$ and $5:2$. The ratio in which these two mixtures be mixed to get a new mixture containing $69\frac { 3 }{ 13 } $% milk, is:

The ratio of spirit and water in two mixtures of 20 liters and 36 litres is 3 : 7 and 7 : 5 respectively. Both the mixtures are mixed together. Now the ratio of the spirit and water in the new mixture is

In a mixture of 30 litres, the ratio of milk to water 2 : 1. The amount of water to be further added to the mixture so as to make the ratio of the milk to water 1 : 2 will be ?

A person has a milk of Rs. 50 per litre. In what ratio should water be mixed with milk so that on selling the mixture at Rs. 40 litres he may get profit of $25 \%$.

In what ratio must a mixture of $30 \%$ alcohol strength be mixed with that of $50 \% $ alcohol strength so as to get a mixture of $45 \%$ alcohol strength ?

$A$ and $B$ are two alloys of gold and copper in the ratio $7 : 2$ and $7 : 11$ respectively. If equal quantities of these two alloys are melted to from a new alloy $C$, then the ratio of gold and copper in $C$ is $:$

Stonechips, sand and cement are mixed in the ratio $4 : 3 : 2$ to make a mixture of $27$ quintal. How much sand is to be mixed into the mixture to make the ratio $6 : 5 : 3$?