The ratio of two numbers is $3:4$ and their $LCM$ is $180$. The second number is:

If $40 \%$ of a number is equal to two-thirds of another number,what is the ratio of the first number to the second number?

The ratio between the present ages of $A$ and $B$ is $5:3$ respectively. The ratio between $A$'s age $4$ years ago and $B$'s age $4$ years hence is $1:1$. What is the ratio between $A$'s age $4$ years hence and $B$'s age $4$ years ago?

The value of $k$ that must be added to $7, 16, 43,$ and $79$ so that they are in proportion is

The number that must be added to each of the numbers $8, 21, 13$ and $31$ to make the ratio of the first two numbers equal to the ratio of the last two numbers is:

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