Solve Division Problem: (+24) ÷ (-0.4) with Sign Rules

Given that we are dividing a positive number by a negative number, the result must be a negative number:

$+:-=-$

First, let's convert 0.4 to a simple fraction:

$0.4=\frac{4}{10}$

Now we have the problem:

$-(24:\frac{4}{10})=$

Let's convert the division to multiplication, remembering to switch the numerator and denominator:

$-(24\times\frac{10}{4})=$

We'll simplify by 4 as follows:

$-(6\times10)=-6\times10=-60$