The ratio of the number of boys and girls in a school of $720$ students is $7: 5$. How many more girls should be admitted to make the ratio $1: 1$?

If $A: B = 8: 15$,$B: C = 5: 8$,and $C: D = 4: 5$,then $A: D$ is equal to:

The ratio of wine and water in a drum is $3:1$. What part of the mixture is taken out and replaced with an equal amount of water so that the ratio of wine and water in the mixture becomes $1:1$?

The ratio of three numbers is $3:6:8$. If their product is $9216$,then what is the sum of the three numbers?

The total of the daily wages of Ram,Shyam and Mohan is $Rs. 450$. If they,respectively,spend $25 \%$,$20 \%$ and $50 \%$ of their incomes,then the ratio of their savings becomes $9:8:4$. What is the income of Ram?

₹ $600$ is divided among $A, B$ and $C$. If $\frac{2}{5}$ of $A$'s share plus ₹ $40$,$\frac{2}{7}$ of $B$'s share plus ₹ $20$,and $\frac{9}{17}$ of $C$'s share plus ₹ $10$ are all equal,then $A$'s share is (in ₹):