R. Gupta Solutions for Chapter: Ratio and Proportion, Exercise 1: EXERCISE

$A$ and $B$ are two alloys of gold and copper prepared by mixing metals in proportions $7:2$ and $7:11$ respectively. If equal quantities of the alloys are melted to form a third alloy $C,$ the proportion of gold and copper in $C$ will be:

The monthly salary of $A, B, C$ is in the proportion of $2:3:5.$ If $C\text{'}\mathrm{s}$ monthly salary is $\mathrm{Rs}.1200$ more than that of $A,$ then $B\text{'}\mathrm{s}$ annual salary is:

A certain amount was divided between Kavita and Reena in the ratio $4:3.$ If Reena’s share was $\mathrm{Rs}.2400,$ the amount is:

In a class, the number of boys is more than the number of girls by $12\%$ of the total strength. The ratio of the boys to girls is:

A right cylinder and a right circular cone have the same radius and the same volume. The ratio of the height of the cylinder to that of the cone is:

A circle and a square have same area. Therefore the ratio of the side of the square and the radius of the circle is:

$A, B$ and $C$ can do a work in $20, 25$ and $30$ days respectively. They undertook to finish the work together for $\mathrm{Rs}.2220,$ then the share of $A$ exceeds that of $B$ by:

A bag contains $25$ paise, $10$ paise and $5$ paise coins in the ratio $1:2:3.$ If their total value is $\mathrm{Rs}.30,$ the number of $5$ paise coin is: