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Driving mathematics
Condition 1 and condition 2 are equivalent conditions.

First look at the condition of 1. If both courses are passed, the sum of the passing ratio of the road test and the theoretical test should be 200%.

Then 70% who passed the theory test and 80% who passed the road test add up to only 150%, which means that 50% of people failed the word test. 1 means that 10% of the students failed, so 50%-20%=30% of the students only passed the single subject exam.

These 30% people are included in 70%+80%, so the proportion of students who have passed both courses is: 150%-30%= 120%, which means that 120%/2 students have passed the theoretical examination. 60% meets the question, so it's right.

The second condition puts forward that 20% of people only pass the road test, so 50% includes 20% students who pass the road test but fail the theoretical test, while 70% students fail the theoretical test, that is to say, 30% students fail the theoretical test, including those who fail both the road test and those who fail the theoretical test, so the proportion of students who fail both is 30%. Therefore, its condition and condition 1 are equivalent and conform to the problem.

So choose d in this question.