In the diagram, the number line between 0 and 5 is divided into 20 equal parts. The numbers $S$ and $T$ are marked on the line. What is the value of $S+T$ ?

![](https://cdn.mathpix.com/cropped/2024_04_20_6ed09463f225f8ba1f07g-032.jpg?height=106&width=683&top_left_y=2148&top_left_x=686)
(A) 5.25
(B) 5.5
(C) 4.5
(D) 4.75
(E) 5
The section of the number line between 0 and 5 has length $5-0=5$.

Since this section is divided into 20 equal parts, the width of each part is $\frac{5}{20}=\frac{1}{4}=0.25$.

Since $S$ is 5 of these equal parts to the right of 0 , then $S=0+5 \times 0.25=1.25$.

Since $T$ is 5 of these equal parts to the left of 5 , then $T=5-5 \times 0.25=5-1.25=3.75$.

Therefore, $S+T=1.25+3.75=5$.

ANSWER: (E)