Numbers $m$ and $n$ are on the number line, as shown. The value of $n-m$ is
(A) 66
(B) 35
(C) 55
(D) 60
(E) 54

![](https://cdn.mathpix.com/cropped/2024_04_20_6ed09463f225f8ba1f07g-044.jpg?height=77&width=607&top_left_y=1750&top_left_x=1106)
On a number line, the markings are evenly spaced.

Since there are 6 spaces between 0 and 30 , each space represents a change of $\frac{30}{6}=5$.

Since $n$ is 2 spaces to the right of 60 , then $n=60+2 \times 5=70$.

Since $m$ is 3 spaces to the left of 30 , then $m=30-3 \times 5=15$.

Therefore, $n-m=70-15=55$.

ANswer: (C)