Question

Solve the following problems by writing a proportion. a) what is 70% of 4b) 5 is what percent of 20?

Answer 1

We have in a) that

`\begin{gathered} 70\cdot\text{ }(4)/(100)\text{ = }\frac{\text{70 }\cdot\text{ 4}}{100} \\ =\text{ 2.8} \end{gathered}`

So the answer for a) is 2.8

Now in b) we have that

`5\cdot\text{ }(100)/(20)\text{ = 25}`

So the answer for b) is 25%.