Calculate Cuboid Volume: Width 10cm with 40% and 50% Proportional Dimensions

Volume Calculations with Proportional Dimensions

Given the cuboid whose width is 10 cm

Length is smaller in 40% of width

The height of the cuboid is equal to 50% of its length

Calculate the volume of the cube

101010

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Calculate the volume of the box
00:03 Width of the box according to the data
00:08 Length of the box according to the data, convert from percentage to number
00:22 Length of the box
00:28 Height of the box according to the data, convert from percentage to number
00:39 Height of the box
00:49 Use the formula to calculate box volume
00:53 Width multiplied by height multiplied by length
00:57 Substitute appropriate values and solve for volume
01:08 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given the cuboid whose width is 10 cm

Length is smaller in 40% of width

The height of the cuboid is equal to 50% of its length

Calculate the volume of the cube

101010

2

Step-by-step solution

To solve this problem of finding the volume of the given cuboid, we will follow these detailed steps:

First, we need to calculate the length of the cuboid:

  • The width is given as 10cm 10 \, \text{cm} .
  • The length is 40% 40\% smaller than the width, so we calculate the change as 0.40×10cm=4cm 0.40 \times 10 \, \text{cm} = 4 \, \text{cm} .
  • Thus, the length is 10cm4cm=6cm 10 \, \text{cm} - 4 \, \text{cm} = 6 \, \text{cm} .

Next, we calculate the height of the cuboid:

  • The height is 50% 50\% of the length.
  • Thus, the height is 0.50×6cm=3cm 0.50 \times 6 \, \text{cm} = 3 \, \text{cm} .

Finally, calculate the volume of the cuboid using the formula:

  • The volume V V is given by V=length×width×height V = \text{length} \times \text{width} \times \text{height} .
  • Substitute the known values: V=6cm×10cm×3cm V = 6 \, \text{cm} \times 10 \, \text{cm} \times 3 \, \text{cm} .
  • Perform the multiplication: V=180cm3 V = 180 \, \text{cm}^3 .

Therefore, the volume of the cuboid is 180cm3 180 \, \text{cm}^3 .

3

Final Answer

180 cm³

Key Points to Remember

Essential concepts to master this topic
  • Formula: Volume = length × width × height for all cuboids
  • Technique: Calculate 40% smaller: 10 - (0.40 × 10) = 6 cm
  • Check: Verify dimensions work: 6 × 10 × 3 = 180 cm³ ✓

Common Mistakes

Avoid these frequent errors
  • Adding percentages instead of finding the actual reduction
    Don't think '40% smaller' means subtract 40 from the width = wrong dimensions! This misunderstands percentage calculations completely. Always calculate the percentage amount first (0.40 × 10 = 4), then subtract from the original value.

Practice Quiz

Test your knowledge with interactive questions

Calculate the volume of the rectangular prism below using the data provided.

888333222

FAQ

Everything you need to know about this question

What does '40% smaller' actually mean?

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'40% smaller' means you subtract 40% of the original value. So for width 10 cm: calculate 40% of 10 (which is 4), then subtract: 10 - 4 = 6 cm.

Why is the height 50% of the length, not the width?

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Read carefully! The problem states 'height equals 50% of its length'. Since we found length = 6 cm, the height = 0.50 × 6 = 3 cm.

How do I remember the volume formula?

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Think of filling a box: you need to know how long, how wide, and how tall it is. Volume = length × width × height tells you how much space is inside!

What if I get the percentage calculations wrong?

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Double-check by working backwards! If length should be 6 cm and width is 10 cm, then 6 is indeed 40% less than 10 because 10 - 6 = 4, and 4/10 = 0.40 = 40%.

Why isn't this called a cube if the question mentions cube?

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Good observation! This is actually a cuboid (rectangular prism), not a cube. The question has a small error - a true cube has all equal sides, but our shape has different length, width, and height.

Can I multiply the dimensions in any order?

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Yes! Multiplication is commutative, so 6 × 10 × 3 = 10 × 6 × 3 = 3 × 10 × 6. They all give the same result: 180 cm³.

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