If this were an equivalent fraction problem, how would you find the value of $x$?

Think about what values would go in a Giant One to turn tenths into fifteenths.

$\left(\frac{x}{10}\right)\left(\frac{1.5}{1.5}\right)=\frac{6}{15}$

This problem becomes $x\left(1.5\right) = 6$. What number multiplied by $1.5$ gives $6$?
You can also notice that $10$ is two-thirds of $15$ and think about what number is two-thirds of $6$.

$x = 4$

This problem is very similar to part (a).

$x = 6$

How could you use a Giant One to find the value of $m$?