Question

Four pieces of wooden sticks $ A, B, C$ and $ D$ are placed along the length of $ 30 cm$ long scale as shown in the figure. Which one of them is $ 3.4 cm$ in length?

• A. $A$
• B. $B$
• C. $C$
• D. $D$

Answer 1

The correct option is C

$C$

Explanation of correct option:

Option C,

From the figure,

Length of the wooden stick $C$,

$$\begin{gathered} I_C=10.4-7 \\ \Rightarrow I_C=3.4cm \end{gathered}$$

Thus, the length of the wooden stick $C$ is $3.4cm$

Option C is correct.

Explanation of incorrect options:

Option A,

Length of the wooden stick $A$,

$$\begin{gathered} l_A=2.8-0.3 \\ \Rightarrow l_A=2.5cm \end{gathered}$$

The length of the wooden stick $A$ is not $3.4cm$.

Option A is incorrect

Option B,

Length of the wooden stick $B$,

$$\begin{gathered} l_B=6.4-3.8 \\ \Rightarrow I_B=2.6cm \end{gathered}$$

The length of the wooden stick $B$ is not $3.4cm$

Option B is incorrect.

Option D,

Length of wooden stick $D$

$$\begin{gathered} I_D=14.5-10.7 \\ \Rightarrow I_D=3.8cm \end{gathered}$$

The length of the wooden stick $D$ is not $3.4cm$

Option D is incorrect.

Therefore, Option C is correct.