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

A rectangular prism has a base measuring 5 units by 8 units.

The height of the prism is 12 units.

Calculate its volume.

121212888555

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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