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
![(30)/(25)=(x)/(10)\\\\\\\Rightarrow(6)/(5)=(x)/(10)\\\\\\\Rightarrow x=5x=60\\\\\Rightarrow x=(60)/(5)\\\\\Rightarrow x=12.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/w5f6wqz3b2t6oto6ngcvmosxiif2a85ws2.png)
Thus, the required value of x is 12 units.