Read a Venn diagram: difference between the all-three region and another region

This type of question, asked 2 times: 24 Sep 2024 S3, 25 Sep 2024 S3. All 2 questions below, oldest first.

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Question 1
24 Sep 2024 S3
20 $Study the given diagram carefully and answer the question that follows. The numbers in different sections indicate the number of persons who can drive different vehicles. What is the difference between the number of persons who can drive all the three vehicles and that of persons who can drive any two of these vehicles?$
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Question 2
25 Sep 2024 S3
20 $Study the given diagram carefully and answer the question that follows. The numbers in different sections indicate the number of students who like to study different subjects. What is the difference between the number of students who like to study all the three subjects and that of students who like to study biology only?$
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Question 1