Question

Assume that a varies directly as b.When the value of a is 5,the value of b is 18.When the value of a is 22,what is the value of b?

Answer 1

In this case we have the proportion 18:5, then we have the equation

`\begin{gathered} (18)/(5)=(b)/(22) \\ b=(18)/(5)*22 \\ b=(396)/(5) \end{gathered}`

Then, when a is 22, the value of b is 396/5 that is also equal to 79.2 or

`79(1)/(5)`