If $a: b: c = 3: 4: 7,$ then the ratio $(a+b+c): c$ is equal to

If $(x+y):(x-y)=11:1$,find the value of $\frac{(5x+3y)}{(x-2y)}$.

Two numbers are such that the ratio between them is $4:7$. If each is increased by $4$,the ratio becomes $3:5$. The larger number is:

The sum of three numbers is $98$. If the ratio of the first to the second is $2:3$ and that of the second to the third is $5:8$,then the second number is

₹ $1980$ is divided among $A, B$ and $C$ such that half of $A$'s part,one-third of $B$'s part,and one-sixth of $C$'s part are equal. Then $B$'s part is (in ₹):

An alloy of copper and zinc is taken in the ratio $1: 2$,and another alloy of the same metals is taken in the ratio of $2: 3$. How many parts of the two alloys must be taken to obtain a new alloy consisting of copper and zinc that are in the ratio $3: 5$?