Question

3 for a construction project, a concrete slab needs to be poured that is 20 cm thick, 10 meters long, and 8 meters wide. what is the volume of concrete needed in cubic meters? a 8 cubic meters b 160 cubic meters c 16 cubic meters d 1.6 cubic meters

Explanation:

Step1: Convert unit

Since \(1\) meter \( = 100\) centimeters, then \(20\) cm \(=\frac{20}{100}=0.2\) m.

Step2: Use volume formula

The volume \(V\) of a rectangular - prism (the concrete slab) is given by \(V = l\times w\times h\), where \(l = 10\) m (length), \(w = 8\) m (width), and \(h=0.2\) m (height or thickness).
Substitute the values into the formula: \(V=10\times8\times0.2\).
First, calculate \(10\times8 = 80\).
Then, \(80\times0.2=\frac{80\times2}{10}=16\) cubic meters.

Answer:

C. 16 cubic meters