Respuesta :
[tex]\bf \begin{array}{|c|ll} \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[/tex]
Answer:
10 blue marbles
Step-by-step 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%)
