Question

Harry has 50 marbles in a bag. 20% of the marbles are blue. How many marbles are blue?

Answer 1

10 blue marbles

Explanation:

50 times 20%, meaning 50 times 20/100 or 50 times 1/5 equals 10.

40 red marbles=80% multiplied by 2 (40 times 2=80%)

10 blue marbles=20% multiplied by 2 (10 times 2= 20%)

Answer 2

`\bf \begin{array} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{20\% of 50}}{\left(\cfrac{20}{100} \right)50}\implies 10`