Question

the movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.
a flashlight is projecting a triangle onto a wall, as shown below.
the original triangle and its projection are similar. what is the missing length $n$ on the projection?
$\bigcirc$ 40
$\bigcirc$ $22\frac{1}{2}$
$\bigcirc$ 35
$\bigcirc$ 10

Explanation:

Step1: Set up similarity proportion

Since the triangles are similar, corresponding sides are proportional: $\frac{n}{20} = \frac{30}{15}$

Step2: Simplify and solve for n

First simplify $\frac{30}{15}=2$, then multiply both sides by 20: $n = 2 \times 20$

Answer:

40