Problem Description:
The image shows a triple-beam balance scale with weights placed on the beams. The task is to determine the mass of the object being measured using the readings from the scale.
Solution Explanation:
A triple-beam balance consists of three sliding weights (beams) that can be adjusted to balance the mass of an object placed on the left pan. Each beam has a specific range of values, and the total mass is calculated by summing the values of the weights on all three beams.
#### Step 1: Identify the Beams and Their Values
The triple-beam balance typically has three beams:
1.
Rightmost Beam (Smallest Range): Usually measures in grams (g).
2.
Middle Beam (Medium Range): Usually measures in tens of grams (10g increments).
3.
Leftmost Beam (Largest Range): Usually measures in hundreds of grams (100g increments).
From the image:
- The
rightmost beam is set at
4 g.
- The
middle beam is set at
30 g.
- The
leftmost beam is set at
90 g.
#### Step 2: Sum the Values
To find the total mass, we add the values from all three beams:
\[
\text{Total Mass} = \text{Leftmost Beam} + \text{Middle Beam} + \text{Rightmost Beam}
\]
\[
\text{Total Mass} = 90 \, \text{g} + 30 \, \text{g} + 4 \, \text{g}
\]
\[
\text{Total Mass} = 124 \, \text{g}
\]
#### Step 3: Verify the Reading
The image confirms the positions of the weights on the beams, and the scale is balanced, indicating that the readings are correct.
Final Answer:
\[
\boxed{124}
\]
Parent Tip: Review the logic above to help your child master the concept of using a balance measuring mass worksheet.
