Geometry Puzzle – Challenge 75
Here you find a math puzzle to develop your child's math skills and geometry facts in a fun way.
Challenge:
If the total surface area of a cube is 3a square feet and the volume of the cube is 2a cubic feet, then what is the total length, in feet, of all the cube’s edges?
A- 12
B- 24
C- 48
D- 64
E- 96
The Absolute Best Book to Challenge Your Smart Student!
The correct answer is C.
A cube has 12 edges. Let x be the edge of the cube. So:
Surface area of the cube = 6 (one side)\(^2 = 6x^2 =3a\)
\(x^2 = \frac{1}{2} a → x = \sqrt{\frac{1}{2 }a} = (\frac{1}{2} a)^{\frac{1}{2}}\)
Volume of the cube = (one side)\(^3 = x^3 =2a → x = \sqrt[3]{2a} = (2a)^{\frac{1}{3}}\)
Solve for a for both equations:
\((\frac{1}{2} a)^{\frac{1}{2}} = (2a)^{\frac{1}{3}}\)
Both sides to the power of 6:
\((\frac{1}{2} a)^3 = (2a)^2 → \frac{1}{8} a^3 = 4a^2
→ \frac{1}{8} a = 4 → a = 32\)
Therefore, the volume of the cube is 64 cubic feet and one side is 4.
The total length of all the cube’s edges is 48 feet. (4 × 12 = 48)The Best Books to Ace Algebra
Original price was: $29.99.$14.99Current price is: $14.99.Original price was: $29.99.$14.99Current price is: $14.99.Satisfied 1 StudentsOriginal price was: $24.99.$14.99Current price is: $14.99.Satisfied 92 StudentsOriginal price was: $24.99.$15.99Current price is: $15.99.Satisfied 125 Students
Related to This Article
More math articles
- Discovering the Magic of Triangle Midsegments
- How to ACE the SAT Math?
- The Ultimate 6th Grade OST Math Course (+FREE Worksheets)
- How to Graph the Cosine Function?
- Top 5 Books for math teachers
- How to Remove Ambiguity in Infinite Limits
- Journey on the Number Line: How to Multiply Unit Fractions with Whole Numbers
- How to Factor by GCF?
- Top 10 8th Grade Common Core Math Practice Questions
- How to Simplify Complex Fractions? (+FREE Worksheet!)
What people say about "Geometry Puzzle – Challenge 75 - Effortless Math: We Help Students Learn to LOVE Mathematics"?
No one replied yet.