X : 8=15:30

Let's solve the equation given in the image:

1. Solve the Equation:

\[ x : 8 = 15 : 30 \]

This can be rewritten in fractional form:

\[ \frac{x}{8} = \frac{15}{30} \]

Simplify \(\frac{15}{30}\) to \(\frac{1}{2}\):

\[ \frac{x}{8} = \frac{1}{2} \]

Cross-multiply to solve for \(x\):

\[ 2x = 8 \]

Divide both sides by 2:

\[ x = 4 \]

2. Task Overview:

1. Find the value of the expressions:

a. \( \frac{3.6}{0.45} = 8 \)

b. \( \left(\frac{2}{4} + \frac{2}{3}\right) \div \frac{3}{4} = \frac{2}{1} = 2 \)

2. Find the value of the expressions:

a. \( 1.2, 0.6, 0.2, 0.4 \)

(Note: The problem seems to involve finding or calculating values, but details are incomplete.)

3. Find the value of the expressions:

Given expression: \(\frac{x}{2.7 - 1.4} = \frac{42.6 - 3.6}{39.3}\)

When \( x = 13 - 3.9 \)

These problems involve simplifying expressions and substituting values as needed. If you need a specific calculation, please clarify.