Answer: The required value of x is 12 units.
Step-by-step explanation: Given that the figure A is a scale image of figure B.
We are to find the value of x.
Since figure A is the scale image of figure B, so both the figures are similar to each other.
Also, the corresponding sides of the similar figures are proportional, so we get
[tex]\dfrac{30}{25}=\dfrac{x}{10}\\\\\\\Rightarrow\dfrac{6}{5}=\dfrac{x}{10}\\\\\\\Rightarrow x=5x=60\\\\\Rightarrow x=\dfrac{60}{5}\\\\\Rightarrow x=12.[/tex]
Thus, the required value of x is 12 units.
