Math Problem Statement

The figure shows two wooden cuboids. How many cuboids B can be cut from cuboid A? Calculate the volume of the small cuboid left over.

Solution

Let's solve the questions based on the information given in the image.

Given Data

  1. Cuboid A:

    • Dimensions: 8cm×12cm×20cm8 \, \text{cm} \times 12 \, \text{cm} \times 20 \, \text{cm}
    • Volume VA=8×12×20=1920cm3V_A = 8 \times 12 \times 20 = 1920 \, \text{cm}^3
  2. Cuboid B:

    • Dimensions: 8cm×6cm×12cm8 \, \text{cm} \times 6 \, \text{cm} \times 12 \, \text{cm}
    • Volume VB=8×6×12=576cm3V_B = 8 \times 6 \times 12 = 576 \, \text{cm}^3

Part (i): How many cuboids B can be cut from cuboid A?

To find out how many cuboids B can fit into cuboid A, we divide the volume of Cuboid A by the volume of Cuboid B: Number of cuboids B=1920576=3.33\text{Number of cuboids B} = \frac{1920}{576} = 3.33 Since only whole cuboids can be cut, we can fit a maximum of 3 cuboids B into cuboid A.

Answer: 3 cuboids B

Part (ii): Calculate the volume of the small cuboid left over.

To find the leftover volume, we calculate the total volume of 3 cuboids B and subtract it from the volume of cuboid A: Volume of 3 cuboids B=3×576=1728cm3\text{Volume of 3 cuboids B} = 3 \times 576 = 1728 \, \text{cm}^3 Remaining volume=19201728=192cm3\text{Remaining volume} = 1920 - 1728 = 192 \, \text{cm}^3

Answer: 192cm3192 \, \text{cm}^3

Would you like further details on any step, or do you have additional questions?


Follow-up Questions:

  1. How would the solution change if Cuboid B had different dimensions?
  2. What if cuboid A had smaller dimensions? How many cuboids B could fit then?
  3. How can we calculate the exact dimensions of the leftover cuboid?
  4. Could we maximize the number of smaller cuboids by re-arranging cuts differently?
  5. What if Cuboid B had a different orientation?

Tip: When dividing volumes to find the number of smaller cuboids fitting into a larger one, always remember to round down to ensure that only full cuboids are counted.

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Math Problem Analysis

Mathematical Concepts

Geometry
Volume of Cuboids
Division

Formulas

Volume of a cuboid = length × width × height

Theorems

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Suitable Grade Level

Grades 6-8