Question

The quotient of a number and -2/3 is -9/10
what is the number?

Answer 1

so
$$\huge {
\cfrac{n}{-\frac{2}{3}} = -\cfrac{9}{10} \implies \cfrac{\frac{n}{1}}{-\frac{2}{3}}= -\cfrac{9}{10}
}
$$

simplify the left side, what fraction would that give you?