A rectangular solid has length $8.5$, width $5$, and height $10$. What is its volume?

The volume of a rectangular solid is the product of its three dimensions: $V = \ell \cdot w \cdot h = 8.5 \times 5 \times 10 = 425$. Fast step-by-step: $8.5 \times 5 = 42.5$, then $42.5 \times 10 = 425$. - Trap A ($23.5 = 8.5 + 5 + 10$) sums the dimensions instead of multiplying. - Trap B ($42.5 = 8.5 \times 5$) stops after two of the three multiplications. - Trap C ($355$) is the **surface area** of the same solid — easy to swap when both formulas are fresh in mind.