Study the sample in Figure 3 carefully and use it to find the number represented by "?" in questions 18 to 20.

To solve this, let's identify the pattern in the given figures.

Sample:

• The numbers are arranged in a cross pattern.
• The relationship seems to involve multiplication or division.

Figure 3:

• First box:

  • Top: 1/4, Bottom: 1/2, Left: 1/4, Right: 1/8
  • Pattern: $\frac{1}{4} \times \frac{1}{2} = \frac{1}{8}$

• Second box:

  • Top: 5, Bottom: 9, Left: 4, Right: 45
  • Pattern: $5 \times 9 = 45$

Using this pattern, the number at the bottom multiplied by the number at the top equals the number on the right.

Now, apply this pattern to find the missing number in the questions 18 to 20.

Please provide the specific question numbers or figures you need help with.