Answer:
C. 15
Step-by-step explanation:
The following proportional can be set-up for the figure given:
[tex] \frac{x + 3}{x} = \frac{10 + 2}{10} [/tex]
Solve for x
[tex] \frac{x + 3}{x} = \frac{12}{10} [/tex]
[tex] \frac{x + 3}{x} = \frac{6}{5} [/tex]
Cross multiply
[tex] 5(x + 3) = x(6) [/tex]
[tex] 5x + 15 = 6x [/tex]
15 = 6x - 5x
15 = x
x = 15
