To determine which expression is equivalent to \(4 \times 5 \times 3\), let's first calculate \(4 \times 5 \times 3\):
\[ 4 \times 5 = 20 \] \[ 20 \times 3 = 60 \]
Now we need to evaluate the given options:
- \(12 \times 4 = 48\)
- \(3 \times 15 = 45\)
- \(4 \times 8 = 32\)
- \(20 \times 3 = 60\)
Among these calculations, \(20 \times 3\) equals \(60\) which matches \(4 \times 5 \times 3\).
Therefore, the correct answer is:
20 x 3.