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A m×n×p rectangular box has half the volume of an (m+2)×(n+2)×(p+2) rectangular box, where m, n, and p are integers. What is the relation between m, n, and p?

a) m+n+p=6
b) m×n×p=2
c) m+n+p=2
d) m×n×p=6

1 Answer

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Final answer:

Upon solving the equation derived from the given conditions, we find that the relation between m, n, and p, given the volume of the two boxes, should be m + n + p = -2. However, this result does not match any of the answer choices provided.

Step-by-step explanation:

The student has asked to find the relation between the dimensions m, n, and p of two rectangular boxes where one box has half the volume of the other larger box with dimensions increased by 2 in each direction (m+2, n+2, p+2). To solve this, let's denote the volume of the smaller box as V. The volume of the larger box would then be 2V. Using the given information:

  • V = m × n × p
  • 2V = (m+2) × (n+2) × (p+2)

Dividing the second equation by the first gives us:

(m+2)×(n+2)×(p+2) / (m × n × p) = 2

(m+2)(n+2)(p+2) = 2mnp

Expanding the left side of the equation and simplifying gives us:

mnp + 2mn + 2mp + 2np + 4m + 4n + 4p + 8 = 2mnp

Canceling out the mnp terms on both sides and dividing everything by 2, we get:

mn + mp + np + 2m + 2n + 2p + 4 = mnp

Subtracting mn, mp, and np from both sides, then factoring out a 2 from the remaining terms, we obtain:

(mn + mp + np) - mn - mp - np = 2(m + n + p + 2)

Since the left side equals zero, we infer:

0 = 2(m + n + p + 2)

Dividing both sides by 2:

0 = m + n + p + 2

Subtracting 2 from both sides gives us the final relation:

m + n + p = -2

However, since the possible answer options do not include m + n + p = -2, and given m, n, and p are integers, we need to check for any possible errors in the question or in available answer choices. It appears that there might be a mistake since none of the provided options match our final result.

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