To determine the number of fire symbols that must be posted for a row of four magazines with one entrance containing Hazard Class 1.2 ordnance, let's follow these steps:
1. Understand the requirements: Each magazine requires one fire symbol at each entrance containing Hazard Class ordnance.
2. Identify the variables:
- Number of magazines: 4
- Number of entrances per magazine: 1
3. Determine the fire symbols per magazine: Since each magazine requires one fire symbol at its entrance, and there is one entrance per magazine, we need one fire symbol per magazine.
4. Calculate the total fire symbols: Multiply the number of magazines by the number of fire symbols per magazine.
- Number of magazines = 4
- Fire symbols per magazine = 1
Therefore, the total number of fire symbols required is:
[tex]\( \text{Total fire symbols} = \text{Number of magazines} \times \text{Fire symbols per magazine} \)[/tex]
[tex]\( \text{Total fire symbols} = 4 \times 1 \)[/tex]
[tex]\( \text{Total fire symbols} = 4 \)[/tex]
The result is that 4 fire symbols must be posted for a row of four magazines with one entrance containing Hazard Class 1.2 ordnance.
So, the correct choice is:
4
