Gold is $19$ times as heavy as water and copper is $9$ times as heavy as water. In what ratio should these be mixed to get an alloy $15$ times as heavy as water?

What is the fourth proportional to $189, 273$ and $153$?

The sum of three numbers is $124$. If the ratio between the first and second is $2:3$ and that between the second and third is $7:9$,then the third number is

If $P: Q = 8: 15$ and $Q: R = 3: 2$,then find $P: Q: R$.

An amount of $Rs. 735$ was divided between $A, B$ and $C$. If each of them had received $Rs. 25$ less,their shares would have been in the ratio of $1:3:2$. The money received by $C$ was

The salaries of $A, B$ and $C$ are in the ratio $2: 3: 5$. If increments of $15\%, 10\%$ and $20\%$ are allowed respectively in their salaries,then what will be the new ratio of their salaries?