Question

For one biology test keith had to answer 45 questions of these questions kenith answered 40% of them correctly. How many questions did keith correctly answer on his test round your answer to the nearest whole number if necessary

Answer 1

well, how much is 40% of 45?

`\begin{array}c \cline{1-1} \textit{\textit{\LARGE a}\% of \textit{\LARGE b}}\\ \cline{1-1} \\ \left( \cfrac{\textit{\LARGE a}}{100} \right)\cdot \textit{\LARGE b} \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{40\% of 45}}{\left( \cfrac{40}{100} \right)45}\implies \text{\LARGE 18}`