Students at a school must choose one subject from Option 1 and one from Option 2 - OCR - GCSE Maths - Question 16 - 2017 - Paper 1

To find the combinations with exactly one language, we consider:

1. French with non-language subjects: 3 combinations (French + Art, French + Geography, French + History)
2. Spanish with non-language subjects: 3 combinations (Spanish + Art, Spanish + Geography, Spanish + History)

So the number of combinations with exactly one language is:

$3 + 3 = 6$

To calculate the percentage of combinations with exactly one language, use the formula:

$ext{Percentage} = \left( \frac{\text{Number of combinations with one language}}{\text{Total combinations}} \right) \times 100$

Substituting the values gives:

$\text{Percentage} = \left( \frac{6}{16} \right) \times 100 = 37.5\%$.

Thus, the percentage of all subject combinations that have exactly one language is 37.5%.