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In a school, students must take at least...

In a school, students must take at least one of these subjects: Maths, Physics or Chemistry. In a group of 50 students, 7 take all three subjects. 9 take Physics and Chemistry only, 8 take Maths and Physics only and 5 take Maths and Chemistry only. Of these 50 students, `x` take Maths only, `x` take Physics only and `x + 3` take Chemistry only. Draw Venn diagram, find `x,` and hence find the number taking Maths.

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