The number of trucks needed is an illustration of rates
The number of trucks needed is 42
How to determine the number of trucks
The size of the backfill is given as: 243 CY
A truck can load up to 162 CF
So, the number of trucks needed is calculated as:
[tex]n = \frac{243 CY}{162 CF}[/tex]
Convert CY to CF
[tex]n = \frac{243 * 27CF}{162 CF}[/tex]
Solve
[tex]n = 40.5[/tex]
Approximate
[tex]n = 41[/tex]
Hence, 41 trucks are needed
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