Question

Find the value of r.A. 3B. 24C. 12D. 2

Answer 1

The value of r can be found as follow

We will use the relationship

`RU=UA`

`18-2r=4r`

Collecting like terms

`\begin{gathered} 2r+4r=18 \\ 6r=18 \end{gathered}`

Divide both sides by 6

`r=(18)/(6)=3`

r=3

Answer = A