Question

There are $3$ blue marbles, $6$ green marbles, and $9$ red marbles. If the total number of marbles are equally divided among five groups, then what is the share of each group?

Answer 1

Total number of marbles $=\text{blue marbles + green marbles + red marbles}$
Total number of marbles $=3+6+9=18$
Number of groups $=5$
Share of each group$=\text{Total number of marbles}÷\text{Number of groups}$

Share of each group $=18÷5$
Therefore, the division expression which represents the share of each group is $18÷5$

The share of each group as a fraction $=\frac{\text{Total number of marbles}}{\text{Number of groups}}$

The share of each group as a fraction = $\frac{18}{5}$ $=\frac{15+3}{5}=\frac{15}{5}+\frac{3}{5}=3+\frac{3}{5}$
Thus,
$\frac{18}{5}=3\frac{3}{5}$

Hence, option D is correct.